An evaluative inventory of research activities and the status of current knowledge of the humid tropic environment was performed through comprehensive critical review of the published literature and through appraisals by outstanding scientific specialists. Technical chapters of this report discuss Physical Features, Plant and Animal Life, Weather and Climate, Coastal Zones, and Regional Studies. Significant gaps in current knowledge of these five topical fields and recommendations to fill these gaps are indicated. Particular attention has been paid to studies and research having direct military application. Three appendices to the compendium present: a Directory of Authorities; a Directory of the Principal Depositories; and an Index of Aerial Photography and Maps. Vol. 1 (KWIC Index - Humid Tropic Environmental Literature) of this report presents a 14,515-document bibliography of the area/ subject in keyword in context format (AD625426).