Jirsa, Mark A.2011-09-282011-09-282011http://purl.umn.edu/115943mapscale 1:100,000enbedrockgeologynorthernMinnesotaCrane LakeBrule NarrowsM-192 Bedrock Geology of the Crane Lake and Brule Narrows 30' X 60' Quadrangles, Northern MinnesotaMap