Check out Book of Healthy and Tasty Food originally published in 1939 (obviously don't have to buy it from Amazon, just wanted a quick link with a pic and description). I have this cookbook and it's pretty amazing. Over 700 pages and it's not just recipes, but also includes loads of info about the science of cooking and preparation itself, and the role that proper nutrition plays in human life, along with many interesting social insights revolving around mealtime culture, farming, seasonal crops, etc. It also unfortunately contains a few outdated sentiments pertaining to the "duty of the housewife". Even though the USSR was the most progressive country on earth in terms of women's rights, we know that sexist views harbored by the masses don't disappear completely overnight.
Another really quirky source is the Book of Tasty and Healthy Food by Anastas Ivanovich Mikoyan from 1939. He was an Old Bolshevik and Soviet era statesman under Lenin, Stalin, & Khrushchev who toured the US in the 1930's and basically copied a ton of American food trends at the time. The USSR was just coming out of a series of disastrous famines and the leaders wanted to encourage people to return to the opulence of the 'better days' and celebrate the new found Communist provided bounty.
The results are weird interpretations of American dishes with Russian flair.
Book of Tasty and Healthy Food: Iconic Cookbook of the Soviet Union by Anastas Ivanovich Mikoyan from 1939. He was an Armenian Communist revolutionary under Lenin, Stalin, Khrushchev and Brezhnev. He was one of the first Soviet officials to tour the US and he picked up a love from American food. After recovering from the food shortages of the '20s, he was tasked with getting Soviets to start cooking at home again. The resulting book is a strange mashup of American influence on traditional Russian cooking.
Any NYTimes cookbook from the 1960's. Where they describe Mexican food as exotic.
Diana Kennedy's Mexican cookbook collection which she donated to the University of Texas San Antonio's Mexican Cookbook Collection, which is comprised of more than 2,000 cookbooks, from 1789 to the present, with most books dating from 1940-2000.
And the greatest cookbook of all time White Trash Cooking