Control leveling.

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Bibliographic Details
Corporate author / creator:U.S. Coast and Geodetic Survey
Edition:Rev. ed.
Imprint:Washington : U.S. Govt. Print. Off., 1948.
Description:23 p. : illus. ; 24 cm.
Language:English
Series:Its Special publication no 226
Special publication (U.S. Coast and Geodetic Survey) no 226.
Subject:
Format: U.S. Federal Government Document Print Book
URL for this record:http://pi.lib.uchicago.edu/1001/cat/bib/3285478
Hidden Bibliographic Details
Notes:"Publications": p. 20-21.