To view and download the official document: http://www.treesearch.fs.fed.us/pubs/4419
Houston, D.R. 1979 Understanding the game of the
environment. US Dept. Agric. Info. Bull. 426, 174 Pages
[ref MA 149]
We have broken it down to six sections.
Pages 146 - 174 Glossary of environmental terms - page 157