TY  - RPRT
TI  - Twenty-First Annual report of the Director of the United States Geological Survey, 1899-1900: Part VII - Texas
AU  - Charles D. Walcott
PY  - 1901
DO  - 10.3133/ar21_7
UR  - https://pubs.usgs.gov/publication/ar21_7
ID  - ar21_7
ER  -