Matches in Library of Congress for { <http://lccn.loc.gov/42050507> ?p ?o. }
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- 42050507 contributor B1021901.
- 42050507 created "[1941]".
- 42050507 date "1941".
- 42050507 date "[1941]".
- 42050507 dateCopyrighted "[1941]".
- 42050507 extent "viii, 109 p. incl. front.,".
- 42050507 issued "1941".
- 42050507 issued "[1941]".
- 42050507 language "eng".
- 42050507 publisher "[Washington] Dept. of science instruction of the National education association of the United States of America".
- 42050507 subject "507".
- 42050507 subject "Q181 .A45".
- 42050507 subject "Science Study and teaching.".
- 42050507 title "Making science instruction more worthwhile.".
- 42050507 type "text".