خيارات البحث
النتائج 241 - 250 من 253
Application of numerical classification in ecological investigations of water pollution
1977
Boesch, Donald F.
Pollution research and monitoring for heavy metals
1977
Mandelli, E.
Effect of air pollution on Pinus strobus L. and genetic resistance
1977
Gerhold, Henry D.
The potential economic impact of selected agricultural pollution controls on two counties in Illinois
1977
Palmini, D. J. | Taylor, C. R. (Charles Robert) | Swanson, E. R. (Earl Raymond)
How to remove pollutants and toxic materials from air and water
1977
Sittig, Marshall
Proceedings, International Conference on Photochemical Oxidant Pollution and its Control
1977-9999
Construction of linings for reservoirs, tanks, and pollution control facilities
1977
Kays, William B.
Proceedings of the 1974 Seminar on Freshwater Pollution in New Zealand
1977
Skrzynski, W. (Walter) | Scott, Donald | Little, Ron W.
National water quality goals cannot be attained without more attention to pollution from diffused or "nonpoint" sources | Report to the Congress by the Comtroller General of the United States
1977
"GAO reviewed overall efforts to controll nonpoint sources of pollution and concluded that progress has been minimal ... The Environmental Protection Agency should do more to plan solutions to nonpoint sources of water pollution ... The Agency agrees that a greater nonpoint source control effort at the Federal, State, and local level is needed. It believes, however, that the present program structure is the best possible, considering the various program constraints."--Page i-iii.
اظهر المزيد [+] اقل [-]Kinds and costs of recreational pollution in the Sandia Mountains
1977
Gray, James R.
