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Mineral Exploration and Development Atlas of the Upper Mississippi Valley District – Iowa County, Wisconsin The Mineral Development Atlas (MDA) was a joint project by the United State Geological Survey (USGS), the United States Bureau of Mines (USBM), and the state surveys of Wisconsin, Illinois, and Iowa, and was launched in 1945 to gather information about mining and exploration in the lead-zinc district. The Atlas consists of section maps at 1:2400 scale showing exploration and mining activity in the lead-zinc district of the Upper Mississippi Valley. When the USGS offices in Platteville, WI closed, the Atlas was distributed to the states. The Wisconsin portion covers primarily Grant, Iowa, and Lafayette Counties, and WGNHS is currently working towards making the Wisconsin portion of the Atlas publicly available online.... Categories: Collection, Data; Tags: Collection, geoscientificInformation, ndc_collection, underDevelopment Mineral Exploration and Development Atlas of the Upper Mississippi Valley District – Lafayette County, Wisconsin The Mineral Development Atlas (MDA) was a joint project by the United State Geological Survey (USGS), the United States Bureau of Mines (USBM), and the state surveys of Wisconsin, Illinois, and Iowa, and was launched in 1945 to gather information about mining and exploration in the lead-zinc district of the Upper Mississippi Valley. The Atlas consists of section maps at 1:2400 scale showing exploration and mining activity in the area. In 1960, when the USGS offices in Platteville, WI closed, the Atlas was distributed to the states. The Wisconsin portion covers primarily Grant, Iowa, and Lafayette Counties, and WGNHS is currently working towards making this part of the Atlas publicly available online. The Lafayette... Categories: Collection, Data; Tags: Collection, geoscientificInformation, ndc_collection, underDevelopment