Archivegrid
http://beta.worldcat.org/archivegrid/
Digital Public Library of America
http://dp.la
European
http://www.europeana.eu/portal/
First Ladies
http://FirstLadies.org
Index to Records of Ante-Bellum Southern Plantations
http://guides.lib.virginia.edu/microformsouthernplantations
JSTOR
http://www.jstor.org
National Agricultural Library
http://www.nal.usda.gov
NUCMC
http://www.loc.gov/coll/nucmc/
NUCMC participants
http://www.loc.gov/coll/nucmc/repositorieslist.html