Search Constraints
You searched for:
Author
Geological and Natural History Survey of Minnesota.
Remove constraint Author: Geological and Natural History Survey of Minnesota.
Subject
Geological maps
Remove constraint Subject: Geological maps
Collection
John R. Borchert Map Library
Remove constraint Collection: John R. Borchert Map Library
Place
Minnesota, United States
Remove constraint Place: Minnesota, United States
1 entry found
Search Results
1. Preliminary geological map of the iron bearing rocks of the northeastern part of Minnesota
1887. Winchell, Newton Horace and Geological and Natural History Survey of Minnesota. Scale approximately 1:330,000 (W 92°41ʹ--W 89°30ʹ/N 48°14ʹ--N 47°43ʹ). Relief shown by hachures. Cover title: Winchell's Geological map of the iron...