خيارات البحث
النتائج 241 - 250 من 253
Environmental requirements and pollution tolerance of common freshwater chironoidae
1977
Beck, William M.
Water quality management guidance for mine-related pollution sources
1977
Deely, Dan
How to remove pollutants and toxic materials from air and water
1977
Sittig, Marshall
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)
Effect of air pollution on Pinus strobus L. and genetic resistance
1977
Gerhold, Henry D.
Proceedings of the 1974 Seminar on Freshwater Pollution in New Zealand
1977
Skrzynski, W. (Walter) | Scott, Donald | Little, Ron W.
Construction of linings for reservoirs, tanks, and pollution control facilities
1977
Kays, William B.
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 [-]Proceedings, International Conference on Photochemical Oxidant Pollution and its Control
1977-9999
Kinds and costs of recreational pollution in the Sandia Mountains
1977
Gray, James R.
