Light and shadows, space relationships through the phenomena of shadowsElementary Science Study. · First published 1975Open the Tome
Teacher's guide for attribute games and problemsElementary Science Study. · First published 1974Open the Tome
Batteries and bulbs IIElementary Science Study · First published 1969 · Latest edition 1971Open the Tome
Teacher’s Guide for Behavior of MealwormsElementary Science Study. · First published 1966Open the Tome
