Varactor Applications (Cambridge, MA: MIT Press, 1962), by Paul Penfield and Robert P. Rafuse (page images at HathiTrust)
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http://catalog.hathitrust.org/Record/001619307
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Varactor Applications (Cambridge, MA: MIT Press, 1962), by Paul Penfield and Robert P. Rafuse (page images at HathiTrust)
New Online Books
http://catalog.hathitrust.org/Record/001619307