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Samuel Ralph Powers
11 cilt bulundu.
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A diagnostic study of the subject matter of high school chemistry
Samuel Ralph Powers · Teachers College, Columbia University
84 sayfa · 1924
Chemistry / Educational tests and measurements / Examinations, questions / Study and teaching / Study and teaching (Secondary)
Our World Changes
Samuel Ralph Powers, Elsie Flint Neuner, Herbert Bascom Bruner, John Hodgdon Bradley · Ginn and Company
578 sayfa · 1940
Kategori yok
You and the wealth of the earth
Samuel Ralph Powers · Bureau of Educational Research in Science, Teachers College, Columbia University
51 sayfa · 1941
Economic Geology / Mineral industries / Mines and mineral resources