A technique for developing content for a professional course in science for teachers in elementary schools - Billig, Florence Grace, 1888-; Originally presented as the author's thesis, Columbia ([New York AMS Press, 1930)
Bibliography: p. 99-101.
Reprint of the 1930 ed., issued in series: Teachers College, Columbia University. Contributions to education, no. 397.
Keywords: Elementary school teachers -- In service training; Science teachers -- Teachers training