TY  - BOOK
AU  - Betsis, Andrew.
AU  - Mamas, Lawrence.
TI  - IELTS: the vocabulary files : English usage upper intermediate : students book : level b1 
SN  - 9781904663416
CY  - United Kingdom
PB  - Global ELT.
KW  - English language
KW  - usage
KW  - sears
N1  - Score: 5.0 - 5.5 - 6.0
ER  -