What are these vintage cards, Lou Gehrig, Babe Ruth, Charles Lindbergh?
 

I bought a collection from an older fellow and he had these old cards. He said they are from the 20's and may be negatives from cards that were made. Among them are Ruth, Gehrig, Lindbergh, Herbert Hoover and a few others. Does anyone know what these are and if there is any value? Thank you.
http://i1192.photobucket.com/albums/...0BB8DA0AB4.jpg
http://i1192.photobucket.com/albums/...0BBCC76FFB.jpg
http://i1192.photobucket.com/albums/...0BC0EF0A95.jpg
http://i1192.photobucket.com/albums/...0BC529D2F0.jpg
http://i1192.photobucket.com/albums/...0BD667D264.jpg
http://i1192.photobucket.com/albums/...0BDA59E97C.jpg
http://i1192.photobucket.com/albums/...0BCEE3BC6C.jpg
http://i1192.photobucket.com/albums/...0BCAA585C2.jpg

1930 Ray-o-print. They were sold in a self developing kit, and photos can still be made today using the original kit, so the photo's themselves don't carry that much value(since there is no way to date them properly). The full kits, from my experience, are fairly rare though.. That's where the real value is.

Thank you very much.