I wasn't sure exactly where to post this, as it is all the four major sports. But, I wanted to show this off, and hopefully I can find that one missing piece at some point in time.
[SIZE="4"][B]Letter 'A'
Red Sox Devern Hansack
2007 SP Authentic BTL /50
<a data-flickr-embed="true" href="https://www.flickr.com/photos/139623482@N06/25353293371" title="BTL Letter A"><img src="https://farm2.staticflickr.com/1590/25353293371_d3a2f207dd_z.jpg" width="376" height="524" alt="BTL Letter A"></a><script async src="//embedr.flickr.com/assets/client-code.js" charset="utf-8"></script>
Letter 'B'
Red Sox Jonathan Papelbon
2008 SP Authentic BTL /50
<a data-flickr-embed="true" href="https://www.flickr.com/photos/139623482@N06/25446224115/in/photostream/" title="BTL Letter B"><img src="https://farm2.staticflickr.com/1617/25446224115_7a8e093417_z.jpg" width="376" height="524" alt="BTL Letter B"></a><script async src="//embedr.flickr.com/assets/client-code.js" charset="utf-8"></script>
Letter 'C'
Celtics Gabe Pruitt
2008 SP Authentic BTL /75
<a data-flickr-embed="true" href="https://www.flickr.com/photos/139623482@N06/24815669914/in/photostream/" title="BTL Letter C"><img src="https://farm2.staticflickr.com/1629/24815669914_3149bd33e1_z.jpg" width="376" height="524" alt="BTL Letter C"></a><script async src="//embedr.flickr.com/assets/client-code.js" charset="utf-8"></script>
Letter 'D'
Red Sox Dustin Richardson
2010 Topps Finest (/217)
<a data-flickr-embed="true" href="https://www.flickr.com/photos/139623482@N06/25420066026/in/photostream/" title="BTL Letter D"><img src="https://farm2.staticflickr.com/1575/25420066026_ab439a0c34_z.jpg" width="376" height="524" alt="BTL Letter D"></a><script async src="//embedr.flickr.com/assets/client-code.js" charset="utf-8"></script>
Letter 'E'
Patriots Taylor Price
2010 Threads Rookie Class /325
<a data-flickr-embed="true" href="https://www.flickr.com/photos/139623482@N06/24815669874/in/photostream/" title="BTL Letter E"><img src="https://farm2.staticflickr.com/1694/24815669874_28b591800d_z.jpg" width="376" height="524" alt="BTL Letter E"></a><script async src="//embedr.flickr.com/assets/client-code.js" charset="utf-8"></script>
Letter 'F'
Patriots Chad Jackson
2006 National Treasures /70
<a data-flickr-embed="true" href="https://www.flickr.com/photos/139623482@N06/25446223925/in/photostream/" title="BTL Letter F"><img src="https://farm2.staticflickr.com/1571/25446223925_618892e1c9_z.jpg" width="377" height="520" alt="BTL Letter F"></a><script async src="//embedr.flickr.com/assets/client-code.js" charset="utf-8"></script>
Letter 'G'
Patriots Rob Gronkowski
2010 Threads Rookie Class /500
<a data-flickr-embed="true" href="https://www.flickr.com/photos/139623482@N06/25641165293" title="BTL Letter G"><img src="https://farm2.staticflickr.com/1544/25641165293_c948c7cbc4_z.jpg" width="371" height="525" alt="BTL Letter G"></a><script async src="//embedr.flickr.com/assets/client-code.js" charset="utf-8"></script>
Letter 'H'
Red Sox Devern Hansack
2007 SP Authentic BTL /199
<a data-flickr-embed="true" href="https://www.flickr.com/photos/139623482@N06/25327824442/in/photostream/" title="BTL Letter H"><img src="https://farm2.staticflickr.com/1617/25327824442_d18f2fe909_z.jpg" width="376" height="524" alt="BTL Letter H"></a><script async src="//embedr.flickr.com/assets/client-code.js" charset="utf-8"></script>
Letter 'I'
Patriots Stevan Ridley
2011 Threads Rookie Class /360
<a data-flickr-embed="true" href="https://www.flickr.com/photos/139623482@N06/25327824402/in/photostream/" title="BTL Letter I"><img src="https://farm2.staticflickr.com/1534/25327824402_82676b700d_z.jpg" width="376" height="520" alt="BTL Letter I"></a><script async src="//embedr.flickr.com/assets/client-code.js" charset="utf-8"></script>
Letter 'J'
Red Sox Jed Lowrie
2009 SP Authentic BTL /33
<a data-flickr-embed="true" href="https://www.flickr.com/photos/139623482@N06/25327824382/in/photostream/" title="BTL Letter J"><img src="https://farm2.staticflickr.com/1547/25327824382_1efa44e369_z.jpg" width="376" height="524" alt="BTL Letter J"></a><script async src="//embedr.flickr.com/assets/client-code.js" charset="utf-8"></script>
Letter 'K'
Red Sox Devern Hansack
2007 SP Authentic BTL /50
<a data-flickr-embed="true" href="https://www.flickr.com/photos/139623482@N06/25150630560/in/photostream/" title="BTL Letter K"><img src="https://farm2.staticflickr.com/1667/25150630560_6093ee818e_z.jpg" width="376" height="524" alt="BTL Letter K"></a><script async src="//embedr.flickr.com/assets/client-code.js" charset="utf-8"></script>
Letter 'L'
Patriots Chad Jackson
2006 National Treasures /70
<a data-flickr-embed="true" href="https://www.flickr.com/photos/139623482@N06/24819513343" title="BTL Letter L"><img src="https://farm2.staticflickr.com/1624/24819513343_3e4cde121d_z.jpg" width="377" height="524" alt="BTL Letter L"></a><script async src="//embedr.flickr.com/assets/client-code.js" charset="utf-8"></script>
Letter 'M'
Patriots Laurence Maroney
2006 Threads Rookie Class /140
<a data-flickr-embed="true" href="https://www.flickr.com/photos/139623482@N06/24819513313/in/photostream/" title="BTL Letter M"><img src="https://farm2.staticflickr.com/1536/24819513313_c650df6eaa_z.jpg" width="377" height="524" alt="BTL Letter M"></a><script async src="//embedr.flickr.com/assets/client-code.js" charset="utf-8"></script>
[SIZE="4"][B]Letter 'A'
Red Sox Devern Hansack
2007 SP Authentic BTL /50
<a data-flickr-embed="true" href="https://www.flickr.com/photos/139623482@N06/25353293371" title="BTL Letter A"><img src="https://farm2.staticflickr.com/1590/25353293371_d3a2f207dd_z.jpg" width="376" height="524" alt="BTL Letter A"></a><script async src="//embedr.flickr.com/assets/client-code.js" charset="utf-8"></script>
Letter 'B'
Red Sox Jonathan Papelbon
2008 SP Authentic BTL /50
<a data-flickr-embed="true" href="https://www.flickr.com/photos/139623482@N06/25446224115/in/photostream/" title="BTL Letter B"><img src="https://farm2.staticflickr.com/1617/25446224115_7a8e093417_z.jpg" width="376" height="524" alt="BTL Letter B"></a><script async src="//embedr.flickr.com/assets/client-code.js" charset="utf-8"></script>
Letter 'C'
Celtics Gabe Pruitt
2008 SP Authentic BTL /75
<a data-flickr-embed="true" href="https://www.flickr.com/photos/139623482@N06/24815669914/in/photostream/" title="BTL Letter C"><img src="https://farm2.staticflickr.com/1629/24815669914_3149bd33e1_z.jpg" width="376" height="524" alt="BTL Letter C"></a><script async src="//embedr.flickr.com/assets/client-code.js" charset="utf-8"></script>
Letter 'D'
Red Sox Dustin Richardson
2010 Topps Finest (/217)
<a data-flickr-embed="true" href="https://www.flickr.com/photos/139623482@N06/25420066026/in/photostream/" title="BTL Letter D"><img src="https://farm2.staticflickr.com/1575/25420066026_ab439a0c34_z.jpg" width="376" height="524" alt="BTL Letter D"></a><script async src="//embedr.flickr.com/assets/client-code.js" charset="utf-8"></script>
Letter 'E'
Patriots Taylor Price
2010 Threads Rookie Class /325
<a data-flickr-embed="true" href="https://www.flickr.com/photos/139623482@N06/24815669874/in/photostream/" title="BTL Letter E"><img src="https://farm2.staticflickr.com/1694/24815669874_28b591800d_z.jpg" width="376" height="524" alt="BTL Letter E"></a><script async src="//embedr.flickr.com/assets/client-code.js" charset="utf-8"></script>
Letter 'F'
Patriots Chad Jackson
2006 National Treasures /70
<a data-flickr-embed="true" href="https://www.flickr.com/photos/139623482@N06/25446223925/in/photostream/" title="BTL Letter F"><img src="https://farm2.staticflickr.com/1571/25446223925_618892e1c9_z.jpg" width="377" height="520" alt="BTL Letter F"></a><script async src="//embedr.flickr.com/assets/client-code.js" charset="utf-8"></script>
Letter 'G'
Patriots Rob Gronkowski
2010 Threads Rookie Class /500
<a data-flickr-embed="true" href="https://www.flickr.com/photos/139623482@N06/25641165293" title="BTL Letter G"><img src="https://farm2.staticflickr.com/1544/25641165293_c948c7cbc4_z.jpg" width="371" height="525" alt="BTL Letter G"></a><script async src="//embedr.flickr.com/assets/client-code.js" charset="utf-8"></script>
Letter 'H'
Red Sox Devern Hansack
2007 SP Authentic BTL /199
<a data-flickr-embed="true" href="https://www.flickr.com/photos/139623482@N06/25327824442/in/photostream/" title="BTL Letter H"><img src="https://farm2.staticflickr.com/1617/25327824442_d18f2fe909_z.jpg" width="376" height="524" alt="BTL Letter H"></a><script async src="//embedr.flickr.com/assets/client-code.js" charset="utf-8"></script>
Letter 'I'
Patriots Stevan Ridley
2011 Threads Rookie Class /360
<a data-flickr-embed="true" href="https://www.flickr.com/photos/139623482@N06/25327824402/in/photostream/" title="BTL Letter I"><img src="https://farm2.staticflickr.com/1534/25327824402_82676b700d_z.jpg" width="376" height="520" alt="BTL Letter I"></a><script async src="//embedr.flickr.com/assets/client-code.js" charset="utf-8"></script>
Letter 'J'
Red Sox Jed Lowrie
2009 SP Authentic BTL /33
<a data-flickr-embed="true" href="https://www.flickr.com/photos/139623482@N06/25327824382/in/photostream/" title="BTL Letter J"><img src="https://farm2.staticflickr.com/1547/25327824382_1efa44e369_z.jpg" width="376" height="524" alt="BTL Letter J"></a><script async src="//embedr.flickr.com/assets/client-code.js" charset="utf-8"></script>
Letter 'K'
Red Sox Devern Hansack
2007 SP Authentic BTL /50
<a data-flickr-embed="true" href="https://www.flickr.com/photos/139623482@N06/25150630560/in/photostream/" title="BTL Letter K"><img src="https://farm2.staticflickr.com/1667/25150630560_6093ee818e_z.jpg" width="376" height="524" alt="BTL Letter K"></a><script async src="//embedr.flickr.com/assets/client-code.js" charset="utf-8"></script>
Letter 'L'
Patriots Chad Jackson
2006 National Treasures /70
<a data-flickr-embed="true" href="https://www.flickr.com/photos/139623482@N06/24819513343" title="BTL Letter L"><img src="https://farm2.staticflickr.com/1624/24819513343_3e4cde121d_z.jpg" width="377" height="524" alt="BTL Letter L"></a><script async src="//embedr.flickr.com/assets/client-code.js" charset="utf-8"></script>
Letter 'M'
Patriots Laurence Maroney
2006 Threads Rookie Class /140
<a data-flickr-embed="true" href="https://www.flickr.com/photos/139623482@N06/24819513313/in/photostream/" title="BTL Letter M"><img src="https://farm2.staticflickr.com/1536/24819513313_c650df6eaa_z.jpg" width="377" height="524" alt="BTL Letter M"></a><script async src="//embedr.flickr.com/assets/client-code.js" charset="utf-8"></script>
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