TY  - BOOK
AU  - Gregorio, Herman Cruz.
AU  - Gregorio, Cornelia M.,
ED  - 
ED  - 
ED  - 
ED  - 
SN  - 2
PY  - 1976///;copyright 197646
CY  - Quezon City
PB  - R. P. Garcia Pub. Co.
KW  - 
KW  - 2
KW  - 0
KW  - 6
KW  - 20
KW  - Education
KW  - Philippines
N1  - Includes bibliographies and index; 5
ER  -