TY  - BOOK
ED  - Educational Broadcasting System.
TI  - Earth's 4.6 billion years, 10 major events - Formation of the supercontinent Pangea
T2  - EBS Contents With education culture and information
CY  - Mapo-gu, Seoul : 
PB  - Publishing Contents Center, 
KW  - Korean Education
KW  - Training & development
N1  - leading educational change
ER  -