Earth and space science : a guide for secondary teachers. Coordination of the writings ... responsibility of: William H. Bolles [and others

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110	1	⊔	‡aPennsylvania. ‡bBureau of Curriculum Services.
245	1	0	‡aEarth and space science : ‡ba guide for secondary teachers. Coordination of the writings ... responsibility of: William H. Bolles [and others.
260	⊔	⊔	‡aHarrisburg] : ‡bBureau of Curriculum Services, Pennsylvania Dept. of Education, ‡c1973.
300	⊔	⊔	‡av, 193p. : ‡billus. ; ‡c28cm.
500	⊔	⊔	‡aWritten by members of the Earth and Space Sciences Writing Committee.
504	⊔	⊔	‡aBibliography: p.191.
538	⊔	⊔	‡aMode of access: Internet.
650	⊔	0	‡aEarth sciences ‡xStudy and teaching.
651	⊔	0	‡aOuter space ‡xStudy and teaching.
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