Bibliographic Information:
McCullagh, J. C. (1977). Pedal Power: In Work, Leisure, and Transportation. Emmaus, PA: Rodale Press, Inc.
Currently all information is available online from either of the following two sites:
http://www.fastonline.org/CD3WD_40/JF/424/19-436.pdf
http://www.cd3wd.com/cd3wd_40/JF/424/19-436.pdf
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