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Cet album photos contient les sous-albums suivants :
Semi-anthracite coal & mudshale (Price Formation, Lower Mississippian; Cloyds Mountain roadcut, Valley Coalfield, Virginia, USA) 1 (29850748104).jpg - Ser Amantio di Nicolao
Geology of the Richmond Basin 1899 Plate XXXIX.jpg - Jstuby
Geology of the Richmond Basin 1899 Plate XLI.jpg - Jstuby
Geology of the Richmond Basin 1899 Figure 111.jpg - Jstuby