Soil survey of Trumbull County, Ohio /
by George N. Coffey and John Woodard and J.M. Snyder.
Coffey, G. Nelson., Snyder, J. M., Woodard, J., United States. Bureau of Soils. (1916). Soil survey of Trumbull County, Ohio. Washington: G.P.O..
Coffey, George Nelson, J. M Snyder, John Woodard, and United States. Bureau of Soils. Soil Survey of Trumbull County, Ohio. Washington: G.P.O., 1916.
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