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http://scitoys.com/scitoys/scitoys/radio/homemade_radio.html - Building A Crystal Radio Out Of Household Items Several simple radio receiver projects, including the razor blade "foxhole" radio, that use found materials. Well illustrated with closeup photographs.
http://histru.bournemouth.ac.uk/CHiDE/Oral_History_of_Defence_Electronics/r_g_wells.htm - R. G. Wells The transcript of an interview with Lieutenant Colonel R. G. Wells, who built a rather elaborate set out of scrounged and improvised items while in a POW camp during World War II. Provided by the Centre for the History of Defence Electronics (CHiDE).
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