1
Published: December, 1983
Superior document: The National geographic magazine Vol. 164(1983) No. 6 [Beilage 1]
2
Published: December, 1981
Superior document: The National geographic magazine 93 (1981) 12 [Beilage 1]
3
Published: July, 1981
Superior document: The National geographic magazine 93 (1981) 7 [Beilage 1]
4
Published: June1983
Superior document: The National geographic magazine 95 (1983) 6 [Beilage 1]
5
Published: April, 1985
Superior document: The National geographic magazine 167 (1985) 4 [Beilage 1]