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32. Low Temperature Zones: Ecological Study for the Twin-Cities Metropolitan Area

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

33. Major River - Water Quantity: Ecological Study for the Twin-Cities Metropolitan Area

1968. Map of Major River - Water Quantity prepared for the Metropolitan Council as a part of An Ecological Study for the Twin-Cities Metropolitan Area. S...

34. Major Rivers - Water Quality - Biological: Ecological Study for the Twin-Cities Metropolitan Area

1968. Map of Major Rivers - Water Quality - Biological prepared for the Metropolitan Council as a part of An Ecological Study for the Twin-Cities Metropo...

35. Major Rivers - Water Quality - Chemical: Ecological Study for the Twin-Cities Metropolitan Area

1968. Map of Major Rivers - Water Quality - Chemical prepared for the Metropolitan Council as a part of An Ecological Study for the Twin-Cities Metropoli...

36. Natural Forest Regions: Ecological Study for the Twin-Cities Metropolitan Area

1968. Map of Natural Forest Regions prepared for the Metropolitan Council as a part of An Ecological Study for the Twin-Cities Metropolitan Area. Scale 1...

37. Navigability: Ecological Study for the Twin-Cities Metropolitan Area

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

38. Physiographic Regions: Ecological Study for the Twin-Cities Metropolitan Area

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

40. Precipitation Zones: Ecological Study for the Twin-Cities Metropolitan Area

1968. Map of Precipitation Zones prepared for the Metropolitan Council as a part of An Ecological Study for the Twin-Cities Metropolitan Area. Scale 1:25...