| Philosophical and Chemical Apparatus - Horne, thornwaite and Wood, Opticians, 123 Newgate Street, London 1850 Advert Google Books LL/34657 Advert was published in "The Overland Companion: Being A Guide for The Traveller to India via Egypt" By J.H. Stocqueler (London: Wm. H. Allen and Co., 1850)
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