Spirit leveling in Illinois, 1914 to 1917, inclusive / work done in cooreration with the State Geological Survey of Illinois.
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| Main Author: | |
| Corporate Authors: | , |
| Format: | Government Document Book |
| Language: | English |
| Published: |
Washington :
Govt. Print. Off,
1918.
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| Series: | Bulletin (Geological Survey (U.S.)) ;
no. 672. |
| Subjects: |