1970 - 1979

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  National Geographic January 1970

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  National Geographic February 1970

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  National Geographic March 1970

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  National Geographic September 1970

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  National Geographic January 1971

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  National Geographic April 1971

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  National Geographic September 1971

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  National Geographic October 1971

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  National Geographic November 1971

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  National Geographic December 1971

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  National Geographic January 1972

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  National Geographic April 1972

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  National Geographic May 1972

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  National Geographic June 1972

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  National Geographic August 1972

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  National Geographic September 1972

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  National Geographic October 1972

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  National Geographic November 1972

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  National Geographic December 1972

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  National Geographic January 1973

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  National Geographic April 1973

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  National Geographic August 1973

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  National Geographic September 1973

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  National Geographic October 1973

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  National Geographic November 1973

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  National Geographic December 1973

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  National Geographic January 1974

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  National Geographic July 1974

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  National Geographic August 1974

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  National Geographic September 1974

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  National Geographic October 1974

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  National Geographic November 1974

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  National Geographic December 1974

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  National Geographic January 1975

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  National Geographic May 1975

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  National Geographic July 1975

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  National Geographic August 1975

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  National Geographic September 1975

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  National Geographic October 1975

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  National Geographic November 1975

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  National Geographic January 1976

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  National Geographic April 1976

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  National Geographic September 1976

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  National Geographic October 1976

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  National Geographic November 1976

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  National Geographic January 1977

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  National Geographic September 1977

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  National Geographic October 1977

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  National Geographic November 1977

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  National Geographic December 1977

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  National Geographic January 1978

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  National Geographic March 1978

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  National Geographic April 1978

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  National Geographic May 1978

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  National Geographic July 1978

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  National Geographic August 1978

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  National Geographic September 1978

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  National Geographic October 1978

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  National Geographic November 1978

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  National Geographic December 1978

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  National Geographic January 1979

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  National Geographic April 1979

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  National Geographic July 1979

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  National Geographic August 1979

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  National Geographic September 1979

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  National Geographic October 1979

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  National Geographic November 1979

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  National Geographic December 1979

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