TY  - RPRT
TI  - Empirical estimates of cumulative refraction errors associated with procedurally constrained levelings based on the Gaithersburg- Tucson refraction tests of the National Geodetic Survey
AU  - R. O. Castle
AU  - T.D. Gilmore
AU  - R. K. Mark
AU  - R.H. Shaw
PY  - 2012
DO  - 10.1029/gl012i005p00239
UR  - https://pubs.usgs.gov/publication/70013031
ID  - 70013031
ER  -