Geological Survey & Kruger, C. L. (1967). Aeromagnetic map of the Perch Lake quadrangle, Houghton, Baraga, and Iron Counties, Michigan. The Survey.
Chicago Style (17th ed.) CitationGeological Survey and C. L. Kruger. Aeromagnetic Map of the Perch Lake Quadrangle, Houghton, Baraga, and Iron Counties, Michigan. Washington, D.C.: The Survey, 1967.
MLA (8th ed.) CitationGeological Survey and C. L. Kruger. Aeromagnetic Map of the Perch Lake Quadrangle, Houghton, Baraga, and Iron Counties, Michigan. The Survey, 1967.
Warning: These citations may not always be 100% accurate.