Bedrock geologic map of the Ashland and the northern part of the Ironwood 30ʹ x 60ʹ quadrangles, Wisconsin and Michigan / U.S. Department of the Interior, U.S. Geological Survey ; by W.F Cannon [and others].
Series Titles:
Miscellaneous investigations series ; map I-2566 Miscellaneous investigations series (Geological Survey (U.S.)) ; map I-2566.
Variant Titles:
Title from margin of envelope: Bedrock geologic map, Ashland and northern part of Ironwood 30ʹ x 60ʹ quads., WI and MI