FEMA - HS and EM Photo Library
FEMA offers nearly 50,000 images, videos and multimedia files in their open source library. (Drop down the COLLECTIONS menu for by-subject lists.) FEMA photo guidance is available at: https://www.fema.gov/photo-video-audio-use-guidelines --
Photographs are not protected by copyright unless noted. ... If not copyrighted, photographs may be downloaded, reproduced and distributed without further permission from FEMA and may be used for educational and informational purposes, including photo collections, textbooks, public exhibits and Internet web pages.