Nice collection, didn't realize you had THAT many. I have two Blue and one Red GasTown books.
See the note in the back of the Red one. Mine only have Red and Blue stamps, not the other colors mentioned.
Note it also has Dates.

Gas Town Stampbook RED001.jpg
Red Book

Gas Town Stampbook RED002.jpg
Inside back cover, no stamps in this book

Gas Town Stampbook001.jpg