TY  - BOOK
AU  - Briggs,Thomas H.
TI  - Improving instruction : : supervision by principals of secondary schools 
U1  - 371.2 
PY  - 1938///.
CY  - New York : 
PB  - The Macmillan Company, 
KW  - School management and organization
KW  - Teaching
KW  - School principals
N1  - Includes index.
ER  -