TY  - RPRT
TI  - Twenty-first annual report of the Director of the United States Geological Survey, 1899-1900: Part I - Director's report, including triangulation, primary traverse, and spirit leveling
AU  - Charles D. Walcott
PY  - 1900
DO  - 10.3133/ar21_1
UR  - https://pubs.usgs.gov/publication/ar21_1
ID  - ar21_1
ER  -