00487nam a22001337a 4500008004100000040005500041080002000096245011300116260005000229300000900279650002100288653001600309653002800325230309b        |||||||| |||| 00| 0 eng d  aNational Science LibrarycNational Science Library  aD 025.31 bH9.1  aRules for Descriptive cataloging in the library of congress: bSupplement 1949-51c/ The Library of Congress  aWashington: bThe Library of congress, c1952  a19p.  aLibrary science   aCataloging   aDescriptive cataloging