"East Broad Top Puzzles: EBT no. 7 and the Mystery of the Moving Main Rod," p. Adams, "Rockhill Furnace Restoration Report: Two Seasons of Progress Give Renewed Energy to the Railroad," p. Drummond, "Tales of a Traveling Salesman: Selling Rockhill Coal, for Better or Worse." Inman, "Book Review: Echoes from the Mines, vol. 2, by Morgan." Keller, From the Archives [application of safety appliances]." Pearson, "Deep Coal Mines on the East Broad Top: Coal Mine Engineering of the Late 1800s," p, s. Stauufer, "Broad Top 101 [steam locomotive valve gears]," s.
Abbreviations denote the following features: g (graph), m (map), p (photograph), and s (sketch or non-photographic illustration).
