| 1 |
New directions in science teaching : a report of a cooperative project in seventeen secondary schools with the Bureau of Educational Research in Science Teachers College, Columbia University / by Anita Duncan Laton and Samuel Ralph Powers
New York : McGraw-Hill , c1949
|
| 2 |
Exploring our world
New ed. - Boston : Ginn , c1946
|
| 3 |
Our world changes
New ed. - Boston : Ginn , c1946
|
| 4 |
Using our world
New ed. - Boston : Ginn , c1946
|
| 5 |
Adventuring in science / by Samuel Ralph Powers ... [et al.]
Boston : Ginn
|
