Cook, A. H Gravity and the earth A. H. Cook - London Wykehan Publictaion 1969 - xi, 95p. - The Wykeham science series for school and universities; no. 6 . ISBN: 0-8448-1108-4 Subjects--Topical Terms: Astronomy and astrophysics thesaurusEarthGravitation Universal Decimal Class. No.: 531.5 / COO