Basic electricity [pt.1]

By Valkenburgh, Van . London The Technical Press 1954 , A Course Of Training Developed For The United States Navy By The New York Firm Of Management Consultants And Graphiological Engineers

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Basic eletricity [pt.2]

By Valkenburgh, Van. London The Technical Press, Ltd 1954 . v.1 (various pagings)

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Basic electricity [pt.1]

Basic eletricity [pt.2]