TY  - BOOK
AU  - Castle,Robert O.
AU  - Mark,Robert K.
AU  - Shaw,Roger H.
TI  - An empirical assessment of refraction error in leveling as a function of survey order and environment: an analysis of the results of three North Anerican field experiments designed to measure the systematic component of the atmospheric refraction error in leveling 
U1  - 526.36 
PY  - 1994///
CY  - Washington
PB  - U.S. Government Printing Office
KW  - Leveling
KW  - Refraction
KW  - Surveying
ER  -