I find old catalogs like these to be a good source of information; I have examples from 1941,1949 and just today I got a 1973 copy. Quite the difference!
First off, the '73 is a full 8 1/2" by 11": I figured by 1973, it would be pretty skimpy, but it's 175 pages and was printed on pretty heavy stock, so it "feels" like O scale.๐
This was the first year they used the term "Craft Train" to separate "real" kits from "shake in the box" types.
Plastic is now common, so along side more modern looking plastic rolling stock kits we have the Roco-made Atlas line of items. In fact, their F9 and little 6-wheel switcher are the only locos I spotted in the entire book...
By then, the Athearn freight kits were under the "Menzies" name: I think that was an Oregon- based firm...(?)
Prices were good; a pair of 6 wheel passenger trucks were 6 bucks, freight bolsters were 75 cents a pair and a basic Unimate lathe was $169.50!
5 full pages of Marnold control gear: (I very recently scored one (just for kicks) which should be here by the weekend.) ๐
Fun stuff to look at...and helpful,too! ๐
Mark in Oregon