please help

[Arnie Schlissel]

Artbeats, & Corbis are good places to start. You might be able to find some stills at various government websites (check the credits carefully to see if the photos are public domain or not!). Also check the prellinger archive on archive.org.

Arnie
https://www.arniepix.com

[Chuck Reti]

U.S. Library of Congress
https://www.loc.gov/