Corrections and revisions for U.S. Geological Survey bulletin 930-D :
Spirit leveling in Illinois, 1896-1942 : part 4, Northern Illinois.

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Related Names
Illinois State Geological Survey.
Language(s)
English
Published
Urbana, Ill. : Illinois State Geological Survey, [1966]
Subjects
Leveling.
Bench-marks.
Attitude (Psychology)
Bench-marks > Illinois.
Leveling.
Illinois.
Illinois > Attitudes.
Note
"December 1966."
"Compiled by Illinois State Geological Survey, Section of Engineering Geology and Topographic Mapping."--Cover, p.1.
Caption title.
Physical Description
27 pages ; 28 cm
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