1. Survey of the northern and northwestern lakes : Ashland and Washburn harbors, Wisconsin Yale Public content 1933. 2012-04-20T20:25:50Z. 2015-10-21T15:22:10Z. U.S. Lake Survey. U.S. Lake Survey, Corps of Engineers. English. Public. Wisconsin, Ashland, Washburn, and Chequamegon Bay (Wis.).