Prints from Living American Art Inc.?

I recently purchased a picture frame from a local junk store for 5 dollars. Upon inspection I found 7 prints by various American artists under the one picture that was set in the frame. Can anyone tell me how to find their value? The artists include Homer Winslow,George Innes, John Worf,Adolf Dehn, Charles Burchfield,Alexander Brook,and George Bellows. Any info you can share would be appreciated. Also they are numbered and marked Living American Art Inc.