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1.
The Earth as Modified by Human Action [recurso electrónico] / George P. Marsh

by Marsh, George P. (George Perkins), 1801-1882.

Material type: Continuing resource Continuing resource; Format: electronic Publisher: Project Gutenberg, 2004Online access: Click here to access online Availability: No items available :

2.
The Fight for Conservation [recurso electrónico] / Gifford Pinchot

by Pinchot, Gifford, 1865-1946.

Material type: Continuing resource Continuing resource; Format: electronic Publisher: Project Gutenberg, 2004Online access: Click here to access online Availability: No items available :

3.
Checking the Waste : A Study in Conservation [recurso electrónico] / Mary Huston Gregory

by Gregory, Mary Huston.

Material type: Continuing resource Continuing resource; Format: electronic Publisher: Project Gutenberg, 2007Online access: Click here to access online Availability: No items available :

4.
The Holy Earth [recurso electrónico] / L. H. Bailey

by Bailey, L. H. (Liberty Hyde), 1858-1954.

Material type: Continuing resource Continuing resource; Format: electronic Publisher: Project Gutenberg, 2010Online access: Click here to access online Availability: No items available :

5.
Proceedings of the Second National Conservation Congress at Saint Paul, September 5-8, 1910 [recurso electrónico] / United States. National Conservation Congress

by United States. National Conservation Congress.

Material type: Continuing resource Continuing resource; Format: electronic Publisher: Project Gutenberg, 2011Online access: Click here to access online Availability: No items available :

6.
Man and Nature; Or, Physical Geography as Modified by Human Action [recurso electrónico] / George P. Marsh

by Marsh, George P. (George Perkins), 1801-1882.

Material type: Continuing resource Continuing resource; Format: electronic Publisher: Project Gutenberg, 2011Online access: Click here to access online Availability: No items available :

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