10 books
Greenberg's Guide to Lionel Trains, 1901-1942
Greenberg's Guide to Lionel Trains, 1945-69
Greenberg's Pocket Price Guide to Lionel Trains, 1901-1993
Greenberg's Pocket Price Guide and Inventory Checklist to Lionel Trains
Greenberg's American Flyer Factory Manual
Greenberg's Guide to Lionel Trains, 1945-1969
Greenberg's Price Guide to Lionel Trains, 1901-1942 & 1945-1983
Repair and Operating Manual for Lionel Trains
Model Railroading
Greenberg's Repair & Operating Manual for Lionel Trains