Yantras or Mechanical Contrivances in Ancient India c2.81
Yantras or Mechanical Contrivances in Ancient India c2.81
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c2.81
¹⁵ G. OPPERT, *On the Weapons, Army Organisation and Political Maxims of the Ancient Hindus with special reference to Gunpowder and Firearms*. 1880. See also *I. H. Q.*, Vols. VII and VIII.