Complete issue of the Proceedings of the 1971 Meetings of the Arizona Section - American Water Resources Assn. and the Hydrology Section - Arizona Academy of Science - April 22-23, 1971, Tempe, ArizonaAugmenting Annual Runoff Records Using Tree-Ring Data; Regional Differences in Runoff-Producing Thunderstorms Rainfall in the Southwest; Uncertainties in Digital-Computer Modeling of Ground-Water Basins; Sulfuric Acid: Its Potential for Improving Irrigation Water Quality; Nitrogen Balance for a 23-Square Mile Minnesota Watershed; Seasonal Effects on Soil Drying After Irrigation; Hydrologic Effects of Soil Surface Micro-Flora; Effects of Fire on Water Infiltration Rates in a Ponderosa Pine Stand; The Use of a Realistic Rainfall Simulator to Det...