600×333 Mosaic Sinkhole, Bone Valley, in PBS airs part of Alan Toth’s Phosphate Mining Movie, by PBS, for WWALS.net, 31 October 2018,
https://wwals.net/2018/11/09/pbs-airs-part-of-alan-toths-phosphate-mining-movie-2018-10-31/
600×333 Mosaic Sinkhole, Bone Valley, in PBS airs part of Alan Toth’s Phosphate Mining Movie, by PBS, for WWALS.net, 31 October 2018,
PBS airs part of Alan Toth’s Phosphate Mining Movie 2018-10-31
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