Books by "Harl Roy Douglass"
4 books found
The Development of Number Concept in Children of Pre-school and Kindergarten Ages
by Harl Roy Douglass
1925
Damped Vibrations
by E. H. McAlister, Earl Leroy Packard, Edmund S. Conklin, Edwin Thomas Hodge, H. R. Crosland, Harl Roy Douglass, Lloyd Leroy Smail, Roger John Williams, William Edmund Milne
1926
The Douglass Standard Diagnostic Tests for Measuring Achievement in First Year Algebra
by Harl Roy Douglass
1924