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Cet album fait partie des albums

↪ Carboniferous rocks in the United States by state
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↪ Pennsylvanian geology of the United States by state
↪ Pennsylvanian rocks in the United States
↪ Rocks in the United States by state by geochronology

Cet album photos contient les sous-albums suivants :

↪ Pennsylvanian formations in the United States by state
↪ Pennsylvanian sedimentary rocks in the United States by state
↪ Pennsylvanian sediments in the United States by state
↪ Pennsylvanian rocks in Alabama
↪ Pennsylvanian rocks in Alaska
↪ Pennsylvanian rocks in Arizona
↪ Pennsylvanian rocks in California
↪ Pennsylvanian rocks in Colorado
↪ Pennsylvanian rocks in Indiana
↪ Pennsylvanian rocks in Kentucky