New Guinea, the world's largest tropical island, is a land of great contrasts, ranging from small glaciers on its highest peaks to broad mangrove swamps in its lowlands and hundreds of smaller islands and coral atolls along its coasts. Divided between two nations, the island and its neighboring archipelagos form Indonesia's Papua Province (or Irian Jaya) and the independent nation of Papua New Guinea, both former European colonies. Most books on New Guinea have been guided by these and other divisions, separating east from west, prehistoric from historic, precontact from postcontact,...