Sources: MoS2

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Samuel L. Clemens to Jane Lampton Clemens, 11 June 1871 · Elmira, N.Y · UCCL00615 MoS2, Mo4, CU-MARK, MoS2
Samuel L. Clemens to Olivia Susan (Susy) Clemens, 25 December 1875 · Hartford, Conn · UCCL01290 MoS2

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