Alexander Graham Bell's Path to the Telephone
http://jefferson.village.virginia.edu/albell/introduction.html
Text and diagrams explain how Bell invented the telephone.

Frederick Winslow Taylor
http://www.lib.stevens-tech.edu/collections/taylor/
The creator of Scientific Management

The Art of Making Money Plenty
http://www.mcny.org/art.htm
Currier & Ives images of the postbellum domestic ideal and departures from it.