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200 1 $aModulation theory$fHarold S. Black
210   $aNew York$cVan Nostrand Reinhold Co.$dcopyr. 1953
215   $aXI, 363 p.$cill. graf.$d24 cm
225 2 $aThe Bell Telephone Laboratories Series
410  0$12001$aThe Bell Telephone Laboratories Series
700  1$aBLACK,$bHarold S.$0323159
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996   $aModulation theory$9785088
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