The internet continues to provide.
Telephone stuff.
Boston in 1930
Flying boats.
http://www.messynessychic.com/2017/12/15/the-long-lost-world-of-the-luxury-flying-boat/
Two Coney Island videos.
Transcontinental air service.
https://www.americanheritage.com/content/transcontinental-air-transport-inc
Public baths in NYC?
https://ephemeralnewyork.wordpress.com/2018/03/19/this-church-was-once-the-1905-allen-street-baths/
https://ny.curbed.com/2014/7/7/10078888/what-became-of-new-york-citys-ubiquitous-public-bathhouses
https://untappedcities.com/2017/09/06/vintage-nyc-photography-nycs-public-baths/
https://en.wikipedia.org/wiki/Asser_Levy_Public_Baths
1929 Boston Marathon.
Fourth Ave bookstores.
https://ephemeralnewyork.wordpress.com/2016/06/06/solitary-browsing-on-fourth-avenues-book-row/
More NYC stuff.
http://daytoninmanhattan.blogspot.com/2014/04/the-lost-louis-stern-mansion-no-993.html
Some construction videos.
1920’s farming.
Antique machines.
Speed boats