Credit for professional improvement of teachers
By: By Bertha Y. Hebb.
Series: [U.S.] Bureau of education.  Teacher's leaflet; no. 16. March, 1922.
Publisher: Govt. print. off.
Published: 1922
Place of publication: [Washington
Language: eng
Subjects: Teachers.
Notes: Caption title.
At head of title:  Department of the interior.