Extensive study of the lunar surface using spacecraft (Ranger, Surveyor, Orbitor, and Apollo projects) and a surge of activity at visible, IR, and radio wavelengths using ground-based telescopes during the past 5 years has resulted in a staggering increase in knowledge of the moon. It is impossible to cover properly even the major results in this limited format. We give here a very abbreviated discussion and refer the interested reader to the project reports and review articles listed in the first section of the bibliography. Individual references in the text are not given when the topic is covered in the appropriate mission report, usually by several authors. Articles that appeared separately in the literature are referenced in the text. The bibliography contains only articles that appear in major scientific journals. Again the extent of the literature has required extensive, and perhaps some improper, deletions.
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