TY  - RPRT
TI  - Procedures and best practices for trigonometric leveling in the U.S. Geological Survey
AU  - Michael L. Noll
AU  - Paul H. Rydlund
PY  - 2020
DO  - 10.3133/tm11d3
UR  - https://pubs.usgs.gov/publication/tm11D3
ID  - tm11D3
ER  -