Newton, J. G. (1971). Sinkhole problem in and near Roberts industrial subdivision, Birmingham, Alabama: A reconnaissance. Geological Survey of Alabama, Division of Water Resources.
Chicago-Zitierstil (17. Ausg.)Newton, John G. Sinkhole Problem in and Near Roberts Industrial Subdivision, Birmingham, Alabama: A Reconnaissance. University, Alabama: Geological Survey of Alabama, Division of Water Resources, 1971.
MLA-Zitierstil (9. Ausg.)Newton, John G. Sinkhole Problem in and Near Roberts Industrial Subdivision, Birmingham, Alabama: A Reconnaissance. Geological Survey of Alabama, Division of Water Resources, 1971.
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