00505nam a2200157Ia 4500003000900000008004100009040001600050080001500066100002100081245009900102260003200201300001300233490005000246650004100296650001000337IN-BaIIA211028s9999    xx            000 0 eng d  cIIA Library  a550.3bHEI  aHeiskanen, W. A. 4aThe earth and its gravity fieldcW. A. Heiskanen                                                aNew YorkbMcGraw-Hillc1958  ax, 470p.  aMcGraw-Hill Series in the Geological Sciences  aAstronomy and Astrophysics Thesaurus  aEarth