enVision Math 2.0, Grade 4, Vol. 1Randall I. Charles, Janet H. Caldwell, Juanita V. Copley, Warren D. Crown · First published 2015Open the Tome
New York Mathematics (Diamond Edition, Grade 6)Randall I. Charles, Warren D. Crown · First published 2008Open the Tome
Mathematics, Grade 3Randall I. Charles, Warren D. Crown, Francis M. Fennell, Janet H. Caldwell, Mary C. Cavanagh · First published 2006Open the Tome
The effects of three different remedial environments on the place value concepts and computation skills of elementary childrenWarren D. Crown · First published 1977Open the Tome
