What do the sequential numbers mean on the Publisher's page of books?

Question: What do the sequential numbers mean on the Publisher's page of books!?

What do these alpha and numerics mean usually at the bottom of the publisher's page in books!? Does it relate to the edition, etc!?Www@QuestionHome@Com

Best Answer - Chosen by Asker:

Information on the verso page of your book is below with links - good luck !.
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http://en!.wikipedia!.org/wiki/First_Editi!.!.!.Www@QuestionHome@Com

It is the catalog number for the library of congress!. The library has a copy of every single book ever published, and that is how it is referenced!.Www@QuestionHome@Com