Research Reports Volume 21 Author:National Geographic Society 87 research and exploration projects supported by NGS in 1980-1983;includes index. Studies include plant recovery from an earthquake-caused landslide in Panama, El Nino effects on seabird breeding at Christmas Island, excavation of prehistoric farming in the Negev Desert, pre-Columbian technology of water harvesting in Sonora,Mexico, biogeograph... more »y in Cretaceous Montana, prehistoric Maya community, Roman baths, Hummingbird migation, deep sea crustaceans, moth eating spiders, deep sea animal pressure tolerance, wolf-moose dynamics, Darwin's Beagle expedition botany,cross-cultural facial expressions, African ant-following birds,etc.« less