Matches in Library of Congress for { <http://lccn.loc.gov/a49006390> ?p ?o. }
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- a49006390 contributor B12857860.
- a49006390 created "[1947]".
- a49006390 date "1947".
- a49006390 date "[1947]".
- a49006390 dateCopyrighted "[1947]".
- a49006390 extent "294 p.".
- a49006390 issued "1947".
- a49006390 issued "[1947]".
- a49006390 language "spa".
- a49006390 subject "373".
- a49006390 subject "Education, Secondary.".
- a49006390 subject "Educational sociology.".
- a49006390 subject "LB1620 .G7".
- a49006390 title "Problemas sociales de la enseñanza secundaria.".
- a49006390 type "text".