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Ground subsidence and structural damage over an abandoned room-and-pillar coal mine at Hegeler, IL

I tiakina i:
Ngā taipitopito rārangi puna kōrero
Ētahi atu kaituhi: Marino, Gennaro G.
Hōputu: Pukapuka
Reo:Ingarihi
I whakaputaina: Pgh. [i.e. Pittsburgh] Pa U.S. Dept. of the Interior, Bureau of Mines 1986
Rangatū:Information circular 9072
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