An Introductory Course in Science for Colleges ... By F.C. Jean, Ezra Clarence Harrah and Fred Louis Herman ... With the Editorial Collaboration of Samuel Ralph Powers
Adventuring in Science. By S. R. Powers ... Elsie Flint Neuner ... Herbert Bascom Bruner ... and John Hodgdon Bradley
Our World and Science. By S.R. Powers ... Elsie Flint Neuner ... Herbert Bascom Bruner ... and John Hodgdon Bradley
