Supervising instruction in secondary schools /
Hammock, Robert C., 1908-
Supervising instruction in secondary schools / by Robert C. Hammo ck and Ralph S. Owings. - New York : McGraw-Hill, 1955. - 316 p. ; 24 cm. - McGraw-Hill series in education. .
School supervision, Secondary.
373.11
Supervising instruction in secondary schools / by Robert C. Hammo ck and Ralph S. Owings. - New York : McGraw-Hill, 1955. - 316 p. ; 24 cm. - McGraw-Hill series in education. .
School supervision, Secondary.
373.11