What are the numbers on the bottom of the spin on the Peterson Field Guide books?

I know they are book numbers. I need the numbers to:
Stars and Planets, Ferns, Warblers, Eastern and/or Western Reptiles and Amphibians, Animal Tracks, Eastern Medicinal Plants, Mammals, Eastern Bird Nests, North American Prairie,
Rocky Mt. Forests, Eastern Forests, Freshwater Fishes, Eastern Birds, Hawks, Feeder Birds(if it has one) and Beetles.
I have all of these buit they are the new editions and dont have the number and i can’t seem to find it anywhere. I know the 1980’s (maybe even early 90’s) and before have the number on the bottom of the spine, usually (in the 80’s) they are in a little colored circle.

What do you need them for? I have a bunch, but they’re all from the last 15 years, and none of them have numbers on them. They seem to have done away with that. But if you’re interested in finding out what other ones they have, you can look here:

http://www.houghtonmifflinbooks.com/peterson/petersonhome.cfm

Incidentally, there are now better guides available for some topics. Some of the Peterson books, like Mammals, are pretty out of date.

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