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Slope: Ecological Study for the Twin-Cities Metropolitan Area
1968. 1:62,500.

Spread city: Ecological Study for the Twin-Cities Metropolitan Area
approximately 1970.

1968. Navigability (Millions of Tons Received and Shipped - Data).

Protection: Ecological Study for the Twin-Cities Metropolitan Area
1968. Chart of Protection prepared for the Metropolitan Council as a part of An Ecological Study for the Twin-Cities Metropolitan Area. Scale 1:250,000 (...

Surface Water Drainage Problems: Ecological Study for the Twin-Cities Metropolitan Area
1970-06. Clason Map Co.

Agricultural Production by Type: Ecological Study for the Twin-Cities Metropolitan Area
1968. Map of Agricultural Production by Type prepared for the Metropolitan Council as a part of An Ecological Study for the Twin-Cities Metropolitan Area...

Annual Precipitation: Ecological Study for the Twin-Cities Metropolitan Area
1968. Map of Annual Precipitation prepared for the Metropolitan Council as a part of An Ecological Study for the Twin-Cities Metropolitan Area. Scale 1:2...