Version history for Tabor, R.W., Frizzell, V.A., Jr., Whetten, J.T., Waitt, R.B., Swanson, D.A., Byerly, G.R., Booth, D.B., Hetherington, M.J., and Zartman, R.E., 2006, Database for the geologic map of the Chelan 30- minute by 60-minute quadrangle, Washington (I-1661): U.S. Geological Survey Data Series 184 [available on the World Wide Web at http://pubs.usgs.gov/ds/2006/184/ ]. Version 1.0 April 21, 2006 Initial release online at http://pubs.usgs.gov/ds/2006/184/ The original geologic map for this database was published in paper form in 1987, based on geologic mapping and compilation by the authors during 1975 through 1980.