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

APA Citation

Pennsylvania. Bureau of Curriculum Services. (1973). 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.

MLA Citation

Pennsylvania. Bureau of Curriculum Services. 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.