Royalty free public domain clipart
2015-03-28azim58 - Royalty free public domain clipart
open clipart
free graphics, free vector diagrams, free cip art
http://www.clker.com/
there's also
http://publicdomainvectors.org/
http://www.pdclipart.org/
www.wpclipart.com/
https://openclipart.org/tags/public%20domain