From the description at Tandem-Associates, there are 6 volumes published by Greenberg. Each covering a different time frame. But occasionally I see a Greenberg's Lionel Catalogue Book 1933-1942 Vol II, like this, and then a Greenberg's Lionel Catalogue Book 1933-1942: Vol III, like this one
Are there multiple volumes for the years 1933-1942? Or did they simply add volumes that changed the order/numbering for later runs? Anyone have any insight?
