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41. 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...

44. 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...

45. 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.

46. 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:...

48. 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...

55. Recreational Sites: Ecological Study for the Twin-Cities Metropolitan Area

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

56. Relief: Ecological Study for the Twin-Cities Metropolitan Area

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

57. Slope: Ecological Study for the Twin-Cities Metropolitan Area

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

60. Soils - Generalized for Agricultural Purposes: Ecological Study for the Twin-Cities Metropolitan Area

1968. Map of Soils - Generalized for Agricultural Purposes prepared for the Metropolitan Council as a part of An Ecological Study for the Twin-Cities Met...