TY  - BOOK
AU  - Davis, Polly , 1930-
TI  - English structure in focus
SN  - 0883770776
AV  - PE1128.D38 1977 
PB  - Newbury
KW  - English language - Textbooks for foreign speakers
KW  - English language - Programmed instruction
KW  - PE
N1  - Includes index
ER  -