Matches in Library of Congress for { <http://lccn.loc.gov/50004904> ?p ?o. }
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- 50004904 contributor B1176638.
- 50004904 coverage "Puerto Rico Social conditions.".
- 50004904 created "1948.".
- 50004904 date "1948".
- 50004904 date "1948.".
- 50004904 dateCopyrighted "1948.".
- 50004904 extent "76 p.".
- 50004904 issued "1948".
- 50004904 issued "1948.".
- 50004904 language "eng".
- 50004904 spatial "Puerto Rico Social conditions.".
- 50004904 subject "HC59 .M53".
- 50004904 subject "Industrialization.".
- 50004904 title "International approaches to problems of undeveloped areas.".
- 50004904 type "text".