You requested books by authors starting with "Llewellyn, T. O.", and with titles starting with "Recovery of rutile from a porphyry copper tailings sample". (Exclude extended shelves)
Llewellyn, T. O.: Recovery of rutile from a porphyry copper tailings sample (U.S. Dept. of the Interior, Bureau of Mines, 1980), also by G. V. Sullivan (page images at HathiTrust)1 item was found.
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