Bibliographic information:
Weightman, David . Design for A Pedal Driven Power Unit for Transport and Machine Uses in Developing Countries . Coventry, UK: Lanchester Polytechnic, 1976.
Currently all information is available online from either of the following two sites:
http://www.fastonline.org/CD3WD_40/CD3WD/INDEX.HTM
http://www.CD3WD.com/C3WD_40/CD3WD/INDEX.HTM
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