Results of spirit leveling in Illinois, 1909 and 1910
By: R.B. Marshall, chief geographer. Work done in cooperation with the state of Illinois.
Contributors: Illinois State Geological Survey
Series: U.S. Geological survey. Bulletin 493
Publisher: Govt. Print. Off.
Published: 1911
Place of publication: Washington
Language: eng
Number of pages: 115
Subjects: Illinois -- Altitudes.
Notes: Includes index.