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- |tree22=Pennsylvanian Subsystem |category2=Pennsylvanian Subsystem2 KB (338 words) - 17:30, 24 January 2017
- |tree22=Pennsylvanian Subsystem |category2=Pennsylvanian Subsystem2 KB (290 words) - 22:48, 20 January 2017
- |tree22=Pennsylvanian Subsystem |category2=Pennsylvanian Subsystem3 KB (401 words) - 20:36, 20 January 2017
- |tree22=Pennsylvanian Subsystem |category2=Pennsylvanian Subsystem2 KB (289 words) - 21:50, 17 February 2021
- |tree22=Pennsylvanian Subsystem |category2=Pennsylvanian Subsystem2 KB (221 words) - 17:04, 21 June 2019
- |tree22=Pennsylvanian Subsystem |category2=Pennsylvanian Subsystem2 KB (352 words) - 16:03, 25 January 2017
- |tree22=Pennsylvanian Subsystem |category2=Pennsylvanian Subsystem2 KB (305 words) - 22:44, 19 January 2017
- |tree22=Pennsylvanian Subsystem |category2=Pennsylvanian Subsystem2 KB (246 words) - 17:41, 23 January 2017
- |tree22=Pennsylvanian Subsystem |category2=Pennsylvanian Subsystem2 KB (302 words) - 22:00, 25 January 2017
- |tree22=Pennsylvanian Subsystem |category2=Pennsylvanian Subsystem2 KB (237 words) - 15:56, 23 January 2017
- |tree22=Pennsylvanian Subsystem |category2=Pennsylvanian Subsystem3 KB (433 words) - 17:31, 24 January 2017
- |tree22=Pennsylvanian Subsystem |category2=Pennsylvanian Subsystem2 KB (266 words) - 16:05, 27 January 2017
- |tree22=Pennsylvanian Subsystem |category2=Pennsylvanian Subsystem2 KB (325 words) - 21:44, 25 January 2017
- |tree22=Pennsylvanian Subsystem |category2=Pennsylvanian Subsystem2 KB (244 words) - 15:50, 27 January 2017
- |tree22=Pennsylvanian Subsystem Nelson, W.J., P.H. Heckel and J.M. Obrad, 2022, Pennsylvanian Subsystem in Illinois: Illinois State Geological Survey, Bulletin (in press2 KB (318 words) - 16:30, 9 February 2022
- |tree22=Pennsylvanian Subsystem |category2=Pennsylvanian Subsystem2 KB (261 words) - 20:55, 26 January 2017
- |tree22=Pennsylvanian Subsystem Nelson, W.J., P.H. Heckel and J.M. Obrad, 2022, Pennsylvanian Subsystem in Illinois: Illinois State Geological Survey, Bulletin (in press3 KB (473 words) - 16:17, 9 February 2022
- |tree22=Pennsylvanian Subsystem |category2=Pennsylvanian Subsystem1 KB (158 words) - 21:30, 2 March 2018
- |tree22=Pennsylvanian Subsystem |category2=Pennsylvanian Subsystem2 KB (251 words) - 15:48, 23 January 2017
- |tree22=Pennsylvanian Subsystem |category2=Pennsylvanian Subsystem1 KB (174 words) - 21:10, 26 January 2017