20928 1126 10 Douglas M.Lambert Primary Author James R.Stock Additional Author mixed material 02560254495 Illinois Richard D.Irwin 1982 An Earth Science Arthur W. Greenstone Additional Author Paul Frantz Brandwein Primary Author Daniel J. Brovey Additional Author Warren E. Yasso Additional Author mixed material 0153659017 New York Harcourt Brace Jovanovich 1975 Paul B. Horton Primary Author Chester L. Hunt Additional Author mixed material 0070304300 New York McGraw-Hill 1980 Robert H.Dott, Jr Primary Author Roger L. Batten Additional Author mixed material 0070176256 San Francisco McGraw-Hill 1976 jay M. Pasachoff Primary Author Naomi Pasachoff Additional Author Timothy M. Cooney Additional Author mixed material 0673137244 Illionis Scoot, Foresman and Company 1983 Eric W. Danielson Primary Author mixed material 0022772200 New York Macmilan Publishing Company 1986 Trends, Challenges and Opportunities Daniel Regard Primary Author Anthony Diana Additional Author mixed material Mayer Brown 2014 Utah State of Education Director mixed material Utah State of Education 2013 Robert I. Mehr Primary Author mixed material 0256033579 Illinois Richard D.Irwin 1986 Marguerite R. Mancini Primary Author Alice T. Gale Additional Author mixed material 0894433377 Maryland An Aspen Publication 1981