TY  - BOOK
AU  - Jones,Leo
TI  - Progress to proficiency: students book 
SN  - 0521425751
AV  - PE1128 .J634 1993
U1  - 428.34 
PY  - 1993///
CY  - New York
PB  - Cambridge University Press
KW  - English language
KW  - Study and teaching English language
KW  - Textbooks for foreign
ER  -