Helen, the only book that I know of that deals with Aglaonema cultivars is Dr. Frank Brown's 'The Amazing Aglaonema'. It contains lots of full color pictures of a great many of the hybrid Aglaonemas on the market today.
If you need some sources for this book, email me privately
and I'll be glad to help you.

If you'd like to send me some pictures of your Aglaonemas privately, I'll do my best to identify them. Or, post them
to this group and get some input from us all.
Russ, central Fla
chammer@cfl.rr.com

Thank you Russ. I am going through the book now to see if I can identify some of them. Seems to be variations among the different cvs. Will post some photos after I have had a good try first.
Helen