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100   $a20020821d1954----km-y0itay50------ba
101 0 $aeng
105   $aa-------001yy
200 1 $aTheory and design of electron beams$fJ. R. Pierce
205   $a2. ed.
210   $aToronto ; New York$cD. Van Nostrand$d1954
215   $a222 p.$cill.$d23 cm
225 1 $a<<The >>Bell telephone laboratories series
610 0 $aFascio elettronico
676   $a537.56
700  1$aPierce,$bJohn Robinson
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