Shows drainage, surface materials and deposits, settlements, etc. Covers also Baja California Norte. "To accompany a report on the physical geography and geology of the coast by W.P. Blake, Esq." "This map is copied ... from the unpublished geological map ... prepared to accompany the report on the geology of the expedition under the command of Lieut. R.S. Williamson, U.S.Top. Engrs." Scale 1:1,608,228 (W 118?35?--W 114?08?/N 34?20?--N 31?40?).
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