Images at the top of the wiki pages:

Cover of McClure's Magazine, Nov. 1903, listing "muckraking" articles by Ray Stannard Baker, Lincoln Steffens, and Cleveland Moffett; no illus
1903 Nov., photographic print.
Reproduction Number: LC-USZ62-75558 (b&w film copy neg.)
http://www.loc.gov/pictures/item/2002697702/

Hedwig Reicher as Columbia in Suffrage Pageant. Bain News Service, publisher
1913 March 3 (date created or published later by Bain), negative : glass.
Reproduction Number: LC-DIG-ggbain-11369
http://www.loc.gov/pictures/item/ggb2005011474/

Standard Oil. Davenport, Homer. 1907, drawing : pen and ink over graphite.
Reproduction Number: LC-DIG-ppmsca-09510
http://www.loc.gov/pictures/item/2005685937/

Splitting backbones and final inspection - hogs ready for cooler, Swift & Co., Chicago. c1906 Feb. 24, photographic print on stereo card : stereograph.
Reproduction Number: LC-USZ62-55730 (b&w film copy neg. of half stereo)
http://www.loc.gov/pictures/item/2004679461/

Tweed-le-dee and Tilden-dum. Illus. in: Harper's weekly, 1876 July 1, p. 525. Nast, Thomas. 1876 July 1, print of wood engraving.
Reproduction Number: LC-USZ62-117137 (b&w film copy neg.)
http://www.loc.gov/pictures/item/96519163/
Woman standing over two children painting in an art class at Hull House. ca. 1924 Feb.
Chicago Daily News negatives collection, DN-0003451.
Courtesy of Chicago History Museum.
http://memory.loc.gov/ammem/ndlpcoop/ichihtml/cdnhome.html

Woman suffrage headquarters in Upper Euclid Avenue, Cleveland. 1912, photographic print.
Reproduction Number: LC-USZ62-30776 (b&w film copy neg.)
http://www.loc.gov/pictures/item/97500065/

Images on the History Head Profile page:
American National Biography: http://libguides.bju.edu/content.php?pid=36466&sid=268967
Dictionary of American Biography: librarything.com
Encyclopedia of American Social Movements: amazon.com
Encyclopedia of the Gilded Age and Progressive Era: seekbooks.com.au
Encyclopedia of Women Social Reformers: helenrappaport.com
Notable American Women: amazon.com

Images on the Primary Sources page:
http://idabwells-barnett1.blogspot.com/2010_04_01_archive.html
http://www.nyu.edu/projects/sanger/search/aboutwed.html