Castle, Robert O. <br/><br/>
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 / 
by Robert O. Castle, Robert K. Mark, and Roger H. Shaw 
 - Washington :  U.S. Government Printing Office,  1994 
 - 50 p. :  ill. ;  28 cm. 
 - U.S. Geological Survey bulletin ;  2114 .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Leveling<br/>Refraction<br/>Surveying
<br/><br/><label>Dewey Class. No.: </label>526.36