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Vol. 12 (from May 1876 to May 1877) includes: Researches in telephony / by A. Graham Bell.
From the above it appears that a complete set of separate issues of the Proceedings, i.e. issues entirely independent of the Journal, comprises the following: Oct. 1852, May 1853, May 1858-May 1888 (except May 1860, which was issued only in the Journal)