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Computing in Technology GmbH

http://www.cit-wulkow.de/

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Union College Math Department History - 1826 - 1877

http://www.math.union.edu/about/history/jackson.html

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Wikipedia: George Washington Goethals

http://en.wikipedia.org/wiki/George_Washington_Goethals

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Goethals' Obituary

http://www.czbrats.com/Builders/goeobit.htm

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The Panama Canal

http://www.czbrats.com/Builders/pancanal.htm

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The Panama Canal

http://www.czbrats.com/Builders/Goethals/contents.htm

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Philosophy of Railroads

http://books.google.com/books?id=9HvOm-Ba6B0C

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A Sequel to The Philosophy of Railroads

http://books.google.com/books?id=2qoE_th8T5oC

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Keefer, Thomas Coltrin

http://www.biographi.ca/EN/ShowBio.asp?BioId=41610

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