You know Lugz, I was thinking about the Craftsman DVD set that many of us reference. I have most of the Sears Catalogs from 1920 through 1993. I am missing 6 or 7 throughout that time span.
There is a bit of information about the timeline of Craftsman ratchets that is missing, since most folks who enjoy studying this topic reference it. For instance, it is missing corresponding catalogs (Fall/Winter, Spring/Summer, Seasonal Supplemental, or consistent Craftsman brochures/flyers) during the 1930s & 1940s. There are individual tools or sets that most people never get to see or learn about as it is incomplete. Compounding the problem, especially in the 1930s, catalogs can and do add/subtract products based on their corresponding regional Sears distribution network. Given this, if you lived in Boston, you weren't necessarily going to have access to the exact same products as in Seattle. The Craftsman DVD set, sadly, doesn't feature this.
Logistically, tackling and acquiring these specific catalogs is a nightmare, let alone finding intact examples to actually reference. Then there is the issue of money, storage, and more.
This is not to say that someone shouldn't want to seek the Craftsman DVD set out. It is an excellent place to start. I absolutely, without reservation, promote folks to go and buy it. 70-80% of what you need is there, but that missing component, especially in the early days, is important.