Clawson, M. (1968). The land system of the United States: An introduction to the history and practice of land use and land tenure. Lincoln: University of Nebraska Press.

Clawson, Marion. The Land System of the United States: An Introduction to the History and Practice of Land Use and Land Tenure. Lincoln: University of Nebraska Press, 1968.

Clawson, Marion. The Land System of the United States: An Introduction to the History and Practice of Land Use and Land Tenure. Lincoln: University of Nebraska Press, 1968.