Heckert, Paul A.
Instructor's manual to accompany introductory astronomy and astrophysics : instructors manual to accompany / by Paul A. Heckert and Thomas J. Balonek - 2nd ed. - New York : Saunders College Publishing, 1987. - 177 p. :
0030045029
Astronomy.
Instructor's manual to accompany introductory astronomy and astrophysics : instructors manual to accompany / by Paul A. Heckert and Thomas J. Balonek - 2nd ed. - New York : Saunders College Publishing, 1987. - 177 p. :
0030045029
Astronomy.