1 online resource (various pagings) : color illustrations, maps, charts
text txt rdacontent
computer c rdamedia
online resource cr rdacarrier
Note
"EPA/600/R-07/045."
"Review Draft. DO NOT CITE OR QUOTE."
"May 2007."
"This document is a preliminary draft. It has not been formally released by the U.S. Environmental Protection Agency and should not at this stage be construed to represent Agency policy. It is being circulated for comment on its technical accuracy and policy implications."
Title from title screen (viewed on July 24, 2012).