Contour interval = 10 ft.; At head of cover title: no. 6.; Explanation of map on 2nd page of cover.; Shows roads, parks, hotels, drainage, etc.; Depth shown by hypsometric tints, bathymetric isolines and soundings.; Includes 9 cross sections.56 x 42 CentimetersJPEGUMN_ALMA:9976561585601701engThe Survey (Madison, Wis)PublicHydrographic map of Delavan and Lauderdale lakes. Walworth Co., WisconsinMapsWisconsinUniversity of Minnesota