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1. 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...
2. 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...
3. Aquifer Recharge Zones: Ecological Study for the Twin-Cities Metropolitan Area
1968. Map of Aquifer Recharge Zones prepared for the Metropolitan Council as a part of An Ecological Study for the Twin-Cities Metropolitan Area. Scale 1...
4. Arctic Ice Chart, April 1, 1968
1968. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 1, 1968. This layer is part of the Arctic Climate System (ACSYS) Hi... Arctic Climate System (ACSYS).
5. Arctic Ice Chart, April 15, 1968
1968. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 15, 1968. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).
6. Arctic Ice Chart, April 22, 1968
1968. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 22, 1968. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).
7. Arctic Ice Chart, April 29, 1968
1968. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 29, 1968. This layer is part of the Arctic Climate System (ACSYS) H... Arctic Climate System (ACSYS).
8. Arctic Ice Chart, April 8, 1968
1968. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 8, 1968. This layer is part of the Arctic Climate System (ACSYS) Hi... Arctic Climate System (ACSYS).
9. Arctic Ice Chart, August 12, 1968
1968. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for August 12, 1968. This layer is part of the Arctic Climate System (ACSYS) ... Arctic Climate System (ACSYS).
10. Arctic Ice Chart, August 19, 1968
1968. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for August 19, 1968. This layer is part of the Arctic Climate System (ACSYS) ... Arctic Climate System (ACSYS).