00498ntaaa2200181   45000030003000000050017000030080021000200400037000410820017000781000019000952450028001142500010001422600059001523000010002115000057002216500020002787000018002980120251027201514.00714s1973  ag    01   aAR-BaBNbspacAR-BaBNeaacrdRIC  a025.5200 Sh7  aShores, Louis   aBasic reference sources  a1 ed.  aChicago : bAmerican Library Association, c1954, 1955  a378 p  aEstudio de los libros de referencia para bibliotecas  aBibliotecologia  aFocke, Helen