Bilby steel tower for triangulation
By: by Jasper S. Bilby.
Series: United States.  Coast and Geodetic Survey.  Special publication no. 158.  Rev. (1940) ed.
Publisher: U.S. Govt. Print. Off.
Published: 1940
Place of publication: Washington
Language: eng
Number of pages: 27
Subjects: Triangulation signal towers.
Other titles: Steel tower for triangulation.
Notes: At head of title: U. S. Dept. of Commerce, Jesse H. Jones, secretary.  Coast and Geodetic Survey, Leo Otis Colbert, director ...