Plus one for the Settlement Cookbook, Aunt Bea.
Two that I like are a sort of series, although they are stand alone cookbooks when published.
The first is Favorite ____ Recipes of Home Economics Teachers, Cassseroles, Salads, Desserts, Holidays, Meat, Main Menu etc. I suppose they published one a year as school fund raisers, and Teachers from across the country submitted a recipe(s) and got their name/ location and school noted at the bottom of each recipe. 1000's of recipes, many similiar or variations. Both the Salads and Desserts Books have A Whole Chapter of Jello recipes!! Spiral Bound. 1960's or 70's.
The other ones I like were published by the Magazine, Farm Journal.
FJ's Country Cookbook, FJ Family Favorites, other titles, AND TaDa-- The FJ Complete Pie Cookbook. late 1960's/ early 70's. The magazine no longer is published nor the cookbooks. Available on Amazon, EBay used bookstores and garage sales.
I also like finding regional cookbooks if / when I go traveling. I have 2 from Kentucky. The 2nd even references the first, even though they are printed 40 years apart. I like looking for cookbooks at garage sales and used bookstores. And Estate sales. And what's on Friends bookshelves, I consider that ok to look at, it's not quite the same as snooping in their medicine cabinet. Well, I wouldn't, but you know somebody does, because things get re-arranged in my own from time to time.
A cookbook I am Looking for is James Beard -- Beard on Bread. Out of Print. Yes, I could go direct to Amazon, except part of the fun is in the Chase.
Fred