000 6019 003 PGUSA 008 040701s2004||||xxu|||||s|||||000 | eng d 040 PGUSA eng 042 dc 100 1 Marsh, George P., 1801-1882 245 14 The Earth as Modified by Human Action [electronic resource] / by George P. Marsh 260 Project Gutenberg, 2004 500 Project Gutenberg 506 Freely available. 516 Electronic text 830 0 Project Gutenberg 6019 856 40 http://www.gutenberg.org/etext/6019 856 42 http://www.gutenberg.org/license Rights