TY  - BOOK
TI  - Blue planet level 6 : : english through science 
SN  - 9780071250351  
U1  - TR 372.45 P867 2005 
PY  - 2005///
CY  - Boston
PB  - McGraw-Hill Interamericana
KW  - Science--Textbooks--Study and teaching
ER  -