UNITED STATES
GEOLOGICAL SURVEY
(South Dakota)

Early U.S. Geological Survey Monuments
Black Hills Region

1893 TRIANGULATION STATIONS

1897 TRIANGULATION STATIONS

DEADWOOD DATUM BENCH MARKS

WIND CAVE MONUMENTS

BLACK HILLS FOREST BOUNDARY POSTS

TOWNSHIP CORNERS

MERIDIAN LINES

Notes SPIRIT LEVELING SOUTH DAKOTA 1896-1910

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© Jerry Penry 2017