المؤلفون: Heiskanen, Weikko A.

المصدر: Scientific American; Sep1955, Vol. 193 Issue 3, p164-174, 7p, 1 Black and White Photograph, 4 Diagrams, 1 Chart, 1 Map

مصطلحات موضوعية: GEOPHYSICS, GRAVITATION, EARTH (Planet), GRAVITY, PROPERTIES of matter, GRAVITATIONAL fields

People: NEWTON, Isaac, 1642-1727