00489nam a22001697a 450000100060000000300100000600500170001604000140003300800410004702000160008810000200010424500650012426000470018930000110023665000420024770000300028916804MX-SIABUC20260702204844.0  aMX-SIABUC050523s1970    us x   j            eng d  a0-15-56251040aBarzun, Jacquer0 aThe modern researcher/cby Jacquer Barzun and Henry F. Graff4 aNew York:bHarcourt,cBrace and World Inc.4 a430 p.  a1.METODOLOGÍA DE LA INVESTIGACIÓN4 aI.Graff, Henry F., coaut.