Hi, shady311. Finally I have got the details of the book that I mentioned before.
The book is:
"Koll's PreisCatalog, Märklin edition"
Edition 1998 - ISBN 3-922164-75-7
Price 49,75DM (just now, I don't remember the exact rate DM/€uro, but I guess that this is around 25€ ~ $24)
The only book that I have access is a 1998 edition, but for sure that they are newer ones. It have photos of most models, so it could be of big help for identify it if you can post a picture of your set.