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===Historical books online===
====General====
*[https://archive.org/details/b28763920 ''The India officer's and trader's pocket-guide. In purchasing the drugs and spices of Asia and the East-Indies: With practical directions for the choice of diamonds, and an accurate account of the Chinese touch-needles [by W. Lewis<nowiki>]</nowiki> ... To which are prefixed, a complete account of the officers privilege ... and the duties of, and drawbacks on, East India goods'']. Compiled from Authority by H D S. 2nd edition 1789 Archive.org. Chinese touch-needles were used to estimate gold purity.
*[http://hdl.handle.net/2027/uc1.$b52048?urlappend=%3Bseq=11 ''Vazeeri Rupi, the silver country of the Vazeers, in Kulu: its beauties, antiquities, and silver mines. Including a trip over the lower Himalayah range and glaciers. With numerous illustrations''] by J. Calvert. 2nd Edition 1873 Hathi Trust. Kulu (Kooloo), Punjab is situated in the hills between Kashmir and Simla.
*''A Manual of the Geology of India''
