Coleman, "Seasonal Learning: Three Years of Spring Explorations Offer Unique Looks into the Railroad," p. Keller, "From the Archives [Rockhill Furnace post office, Orbisonia station]," p. Mellander, "'Modern' Vintage Freight: Photo Charter Recaptures the Past," p. Pearson, "Deep Coal Mines on the East Broad Top: Tail-Rope Haulage System for Rockhill no. 5," p, s. Stauffer, "Broad Top 101 [steam locomotive valve gears];" "East Broad Top Puzzles: Some Possible Answers." Vliet, "'Signs' of Life: New Billboards Point Visitors in the Right Direction," p.
Abbreviations denote the following features: g (graph), m (map), p (photograph), and s (sketch or non-photographic illustration).
