U.S.P.R.R. Exp. & Surveys-Cal. & Oregon. General Report-Plate XIII. Curves illustrating the tables of horary oscillation deducted from observations taken on the survey
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Beinecke Rare Book and Manuscript Library > U.S.P.R.R. Exp. & Surveys-Cal. & Oregon. General Report-Plate XIII. Curves illustrating the tables of horary oscillation deducted from observations taken on the survey