http://book.klll.cc/ebooks/subject/12249.opds 2025-08-03T22:40:33Z Books about Conservation of natural resources (sorted by popularity) Free eBooks since 1971. Project Gutenberg https://book.klll.cc webmaster@gutenberg.org https://book.klll.cc/gutenberg/favicon.ico 25 1 2025-08-03T22:40:33Z https://book.klll.cc/ebooks/subject/12249.opds?sort_order=title Sort Alphabetically by Title 2025-08-03T22:40:33Z https://book.klll.cc/ebooks/subject/12249.opds?sort_order=release_date Sort by Release Date 2025-08-03T22:40:33Z https://book.klll.cc/ebooks/37957.opds Man and Nature; Or, Physical Geography as Modified by Human Action George P. Marsh 2025-08-03T22:40:33Z https://book.klll.cc/ebooks/20653.opds Checking the Waste: A Study in Conservation Mary Huston Gregory 2025-08-03T22:40:33Z https://book.klll.cc/ebooks/33178.opds The Holy Earth L. H. Bailey 2025-08-03T22:40:33Z https://book.klll.cc/ebooks/6019.opds The Earth as Modified by Human Action George P. Marsh