Hydrology of basalt aquifers and depletion of ground water in east-central Washington. Water Supply Bulletin 33 (1974) describes an investigation into the hydraulic characteristics and effects of present and projected pumpage of the basalt aquifers of east-central Washington State. This bulletin includes specific capacity data and pumping test results for selected wells in Lincoln, Grant, Spokane, Adams, Whitman, and Franklin counties, WA.