Colorado State University. Environmental Resources Center, author2007-01-032007-01-031971http://hdl.handle.net/10217/20262January 1971.reportsengCopyright and other restrictions may apply. User is responsible for compliance with all applicable laws. For information about copyright law, please see https://libguides.colostate.edu/copyright.Natural resources -- Research -- United States -- DirectoriesEnvironmental protection -- Research -- United States -- DirectoriesText