Washington, D.C., January. U.S. Environmental Protection Agency (1974b) National Strategy for Control of Sulfur Oxides from Electric Power Plants, Washington, D.C., July 10. U.S. Environmental Protection Agency (1974) Implications of Alternative Policies for the Use of Permanent Controls and Supplemental Control Systems (SCS), November 18.
Welch, R.E. (1974) American Smelting and Refining Company, Tacoma, Washington, private communication, December 6.
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12 Control of Ambient Sulfur Dioxide Concentrations with Tall Stacks and/or Intermittent Control Systems ."
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As of 2013, the National Science Education Standards have been replaced by the Next Generation Science Standards (NGSS), available as a print book, free PDF download, and online with our OpenBook platform.
The NGSS offer a detailed description of the key scientific ideas and practices that all students should learn by the time they graduate from high school. The standards are based largely on the 2011 National Research Council report A Framework for K-12 Science Education: Practices, Crosscutting Concepts, and Core Ideas.