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site link
http://babel.hathitrust.org/cgi/pt
http://babel.hathitrust.org/cgi/ptid=mdp.39015013530053;q1=increasing%20human;start=1;size=100;page=root;view=image;seq=193;num=175
http://babel.hathitrust.org/cgi/pt?id=mdp.39015013530053;q1=increasing%20human;start=1;size=100;page=root;view=image;seq=193;num=175
http://americanhistory.si.edu/archives/d8047.htm
http://errol.oclc.org/laf/n78086404.html
http://www.sciencemuseum.org.uk/objects/electricity_supply/1927-157.aspx