Exploring Our WorldSamuel Ralph Powers, Elsie Plint Neuner, Herbert Bascom Bruner and John Hogdon Bradley · First published 1940Open the Tome
Our World ChangesSamuel Ralph Powers, Elsie Flint Neuner, Herbert Bascom Bruner, John Hodgdon Bradley · First published 1940Open the Tome
A diagnostic study of the subject matter of high school chemistrySamuel Ralph Powers · First published 1924Open the Tome
A history of the teaching of chemistry in the secondary schools of the United States previous to 1850Samuel Ralph Powers · First published 1920Open the Tome
