Earth and space science :
a guide for secondary teachers. Coordination of the writings ... responsibility of: William H. Bolles [and others.
Harrisburg] : Bureau of Curriculum Services, Pennsylvania Dept. of Education, 1973.
Earth sciences /
Study and teaching.
Outer space > Outer space / Study and teaching.
Written by members of the Earth and Space Sciences Writing Committee.
v, 193p. :
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