Periscope Films uploads a lot of public domain US government material, and has it decently organized. The asbestos series is also interesting, hindsight being 2

Periscope Films uploads a lot of public domain US government material, and has it decently organized. The asbestos series is also interesting, hindsight being 20-20. See https://m.youtube.com/@PeriscopeFilm/playlists https://m.youtube.com/@PeriscopeFilm/playlists