User:Postdlf/CS sources

http://www.metmuseum.org/toah/hd/shee/hd_shee.htm

http://www.metmuseum.org/toah/hd/prec/hd_prec.htm

http://www.nga.gov/cgi-bin/tbio?person=204140

http://www.phillipscollection.org/research/american_art/bios/sheeler-bio.htm

http://www.butlerart.com/pc_book/pages/charles_sheeler_1883.htm

http://www.npr.org/templates/story/story.php?storyId=5410362

http://www.getty.edu/art/gettyguide/artMakerDetails?maker=2079