TY  - RPRT
TI  - Results of spirit leveling in Illinois, 1896 to 1908, inclusive
AU  - Samuel Stinson Gannett
AU  - David Henry Baldwin
PY  - 1910
DO  - 10.3133/b421
UR  - https://pubs.usgs.gov/publication/b421
ID  - b421
ER  -