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21. Economic Minerals: Ecological Study for the Twin-Cities Metropolitan Area

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

22. Existing Forest Cover and Forest Related Industry: Ecological Study for the Twin-Cities Metropolitan Area

1968. Map of Existing Forest Cover and Forest Related Industry prepared for the Metropolitan Council as a part of An Ecological Study for the Twin-Cities...

23. Existing Forest Cover: Ecological Study for the Twin-Cities Metropolitan Area

1968. 1:62,500.

24. Existing Urbanization: Ecological Study for the Twin-Cities Metropolitan Area

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

25. Existing Vegetation: Ecological Study for the Twin-Cities Metropolitan Area

1968.

26. Existing Vegetation: Ecological Study for the Twin-Cities Metropolitan Area

1968. 1:62,500.

27. Foundation Conditions: Ecological Study for the Twin-Cities Metropolitan Area

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

28. Glaciation Movements: Ecological Study for the Twin-Cities Metropolitan Area

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

29. High Temperature Zones: Ecological Study for the Twin-Cities Metropolitan Area

1968. Map of High Temperature Zones prepared for the Metropolitan Council as a part of An Ecological Study for the Twin-Cities Metropolitan Area. Scale 1...

30. Historical Landmarks: Ecological Study for the Twin-Cities Metropolitan Area

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