The long distance transport and ultimate deposition of acidic contaminants along air sheds has made acid precipitation both a regional problem and an international concern. Acid precipitation has been reported in Sweden, Norway, Japan, the United States, and Canada. This abstracted bibliography contains 961 citations on the health and environmental effects of acid precipitation. Contaminants of primary interest are sulfuric and nitric acids, sulfates and nitrates, and ammonium. The research directory, which can be found at the end of the bibliography, contains information concerning current research projects including the title of the project, organization conducting the research, principal investigator, sponsor, and supplementary material with a brief project description.