Incoming Resources
- Results of spirit leveling in Ohio, 1898 to 1908, inclusive, compiled by S.S. Gannett and D.H. Baldwin ; in cooperation with the State of Ohio during 1901 to 1908, inclusive
- Results of spirit leveling in Ohio, 1911, R.B. Marshall
- Spirit leveling in Ohio, 1898 to 1916, inclusive, R.B. Marshall
- Results of spirit leveling in Ohio, 1909 and 1910, R.B. Marshall