1. Plan and profile of middle fork Eel River, California : to mile 34 ; Black Butte River to mile 4 ; and tributaries Maps University Of Minnesota Public content 1926. Geological Survey (U.S.). Relief shown by contours and spot heights.; "Surveyed in 1924-5."; Vertical scale of profiles 1 in. = 40 ft.; Includes "Key map of plan sheets" on ... The Survey (Washington).