Interesting story here, about one Carol Highsmith
facing demands from Getty Photos for payment to
use her own photos, which she put in public domain:

http://arstechnica.com/tech-policy/2...ted-to-public/

All of her public domain photos are searchable at
the Library of Congress. Here's a link for the car buffs:

http://www.loc.gov/pictures/search/?... =false&op=AND