Book: Marine Life: The Changeless Horseshoe Crab (National Geographic) (April 1981, 159) - National Geographic

Book: National Geographic Magazine April 1981 Volume 159 Number 4 - National Geographic Society

Book: National Geographic: Vol. 159, No. 4, April 1981 - National Geographic

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National Geographic April 1981 Popular Q&A

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National Geographic April 1981 Helpful Resources

A Grim Struggle for Survival - National Geographic Magazine
Originally published in the April 1981 issue of National Geographic. Dian Fossey reports from the field on the death of Digit and her gorilla research in Africa.

Archive Photo Gallery - National Geographic Magazine
Originally published in the April 1981 issue of National Geographic. Dian Fossey reports from the field on the death of Digit and her gorilla research in Africa.

The Imperiled Mountain Gorilla - National Geographic Magazine ...
(Originally published in the April 1981 issue of National Geographic). By Dian Fossey. It was Digit, and he was gone. The mutilated body, head and hands ...