TY  - ADVS
AU  - 
TI  - National geographic: the 1970s
U1  - CA-01 
PY  - 1888///-1999
CY  - 
PB  - National Geographic Society
N1  - Contents: Cd.1. January 1970 - April 1973 - Cd.2. May 1973 - August 1976 - Cd.3. September 1976 - December 1979
ER  -