The physics concepts in grade school science have been determined by examining some thirty grade school science readers. These have been classified by grades.
Proceedings of the Iowa Academy of Science
©1941 Iowa Academy of Science, Inc.
Lapp, C. J.
"Physics Concepts in Grade School Science (Abstract),"
Proceedings of the Iowa Academy of Science, 48(1), 308-308.
Available at: https://scholarworks.uni.edu/pias/vol48/iss1/84