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An educational pamphlet describing how to build a crystal radio produced by the Cooperative Extension Service as part of an Advanced Electric Guide Sheet series of 4-H projects. This title was part of a series of several additional radio-related topics. Later sheets in the series note that they were published when Winthrop Libby was Director of Cooperative Extension, helping to date the piece circa 1965. Libby served as the Director of the Cooperative Extension Service before being named President of the University of Maine in 1969.
University of Maine Cooperative Extension Service, "Build a Crystal Radio: Electronics Series - Part I" (1965). General University of Maine Publications. 286.
publisher's version of the published document