00518nam a2200181Ia 4500003000900000008004100009020001800050040001600068080001500084100001500099245003800114260003800152300001300190490006600203650004100269650001000310650001600320IN-BaIIA211028s9999    xx            000 0 eng d  a0-8448-1108-4  cIIA Library  a531.5bCOO  aCook, A. H 0aGravity and the earthcA. H. Cook  aLondonbWykehan Publictaionc1969  axi, 95p.  aThe Wykeham science series for school and universities; no. 6  aAstronomy and astrophysics thesaurus  aEarth  aGravitation