Recent pickup..1980 Topps....cut card values

[azdbacks1998]

Recently picked up a lot of 1980 Topps cut cards....can I get some help on the value of these?
They are in good shape...besides being separated from their counterparts of course...is there any value associated to these cards when separated?

They are:
Larry Bird #30
Larry Bird #34
Magic Johnson #139
Larry Bird #31
Julius Erving #181
Julius Erving #174
Julius Erving #262
















....why does it have 1969 and 1980 dated on the back? Anyone have some knowledge they can shed on these cards....value in its cut state..and any other general knowledge would be appreciated.

Excuse my ignorance...but school me if you can.

Thanks!

[key2win]

The only value they show in Beckett is for the panel cards (3 uncut cards in one). I have no clue how the ripped cards affect the value.