9781439804421 | 6 revised edition (CRC Pr I Llc, June 25, 2012), cover price $1043.00

9780849398438, titled "Encyclopedia of Environmental Science And Engineering" | 5th edition (CRC Pr I Llc, December 27, 2005), cover price $950.00

9789056996369, titled "Encyclopedia of Environmental Science and Engineering" | 4 rev upd edition (Taylor & Francis, March 1, 1999), cover price $919.00

9782881245046, titled "Encyclopedia of Environmental Science and Engineering" | 3 rev upd edition (Routledge, April 1, 1992), cover price $800.00

9780677064307 | Gordon & Breach Science Pub, November 1, 1983, cover price $829.00

9780677064208, titled "Encyclopedia of Environmental Science and Engineering" | 2 edition (Gordon & Breach Science Pub, June 1, 1983), cover price $247.00

9780816065110, titled "Encyclopedia of Environmental Studies" | 3 edition (Facts on File, August 1, 2012), cover price $150.00

9780816042555, titled "Encyclopedia of Environmental Studies" | New edition (Facts on File, June 1, 2001), cover price $75.00 | About this edition: Defines terms dealing with botany, economics, chemistry, ecology, biology, geography, and geology, and identifies important organizations, individuals, and events.

9780816015313 | Facts on File, December 1, 1991, cover price $65.00 | About this edition: Defines terms dealing with botany, economics, chemistry, ecology, biology, geography, and geology, and identifies important organizations, individuals, and events

9781493927746 | 2 edition (Springer Verlag, February 24, 2018), cover price $9050.00

9780387894690 | Springer Verlag, September 30, 2012, cover price $8100.00

9781441908520 | Pap/dol edition (Springer Verlag, February 28, 2013), cover price $12180.00

9780205260911, titled "Internet Adventures: Version 1.2 : Step-By-Step Guide to Finding and Using Educational Resources" | Prentice Hall, April 1, 1996, cover price $26.95 | also contains Internet Adventures: Version 1.2 : Step-By-Step Guide to Finding and Using Educational Resources