This is an amazing archive put together by the American Library of Congress. Over 900 posters from the depression. This is an amazing resource for any type of historic type research relevant to the 1920s-1940s. Check it out!
Fonts In Use shows you how various fonts are used. Super useful resource. Search by industry, formats and typefaces.
Created in 1461 by Claude Garamont it comes through the ages and still fits the modern life of typography and design. From http://designcollector.net/garamond-450/
Independent foundry working to create a stronger Canadian typographic presence. Practice Foundry | Blog
Free fonts Part 1 | Free Fonts Part 2 | From Smashing Magazine
Here are few fonts for your poster’s credits. Choose the one you like. I would recommend using SteelTongs – it has categories as glyphs. SteelTongs Empire Univers LT Std Thin Ultra SteelTongs Empire Univers