Two maps give the locations and estimated yields of unconsolidated and bedrock aquifers of upstate New York, excluding Long Island. The map of surficial deposits give estimates of well yield, aquifer yield, and specific capacity; the map of bedrock units gives the same information and also delineates areas in which induced infiltration from streams into the bedrock and unconsolidated aquifers is possible. The maps are designed to assist planners in managing ground-water supplies. The maps represent data that were compiled in 1969 but not previously published. (USGS)