000			00379nam a2200157Ia 4500
008			160615s9999 xx 000 0 und d
100			_aGRAVITY RESEARCH FOUNDATION
245			_aEssays on Gravity
260			_aMassachusetts
260			_bGravity Research Foundation
260			_c1962
300			_a1 p. + 212
942			_cBooks
999			_c13369 _d13369