Bilby steel tower for triangulation /

Bibliographic Details

Main Author:	Bilby, Jasper S. (Jasper Sherman), 1864-1949
Format:	Government Document Book
Language:	English
Published:	Washington : United States Government Printing Office, 1940.
Series:	Special publication (U.S. Coast and Geodetic Survey) ; no. 158; rev. (1940) ed.
Subjects:	Triangulation signal towers. Geodésia.