00268nam a2200109Ia 450000500170000000800410001708200170005810000200007524500250009526000300012030000080015020260205040308.0260111s9999||||xx |||||||||||||| ||und||  a520.9  Ab37H  aAbetti, Giorgio 0aHistory of astronomy  aN.Y.bHenry schumanc1952  a338