TY  - BOOK
AU  -  National center for educational research and development
ED  - Ministry of national education youth and sports
TI  - Life Science: Secondary education third year litterature and humanites sociology and economics section 
U1  - 570.712 LH-SE Life Science 
PY  - 2015///
CY  - Sin El Fil
PB  -  National center for educational research and development
KW  - Litterature and Humanites section-- Study and teaching (Secondary Grade 12) -- Textbooks
KW  - Sociology and Economics section-- Study and teaching (Secondary Grade 12) -- Textbooks
ER  -