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The land ethic
Leopold, A., (2009)
The practice of legal and tax regulation of land relations in agriculture in Russia
Baynova, Maria S., (2016)
Land in California
Robinson, William Wilcox, (1979)
Report of the President's committee on wild-life restoration
Beck, Thomas Hambly, (1934)
The ecosystem and man
Smith, Robert Leo, (1972)
Ecologist meets economics : Aldo Leopold, 1887 - 1948
Goodwin, Craufurd D. W., (2008)