"In Memoriam: Richard B. Keller, 1952-2004," p. Hart, "Adventures of an East Broad Top Railfan, part 2: Rockhill Mine no. 9, June 1968," p, s. Vliet, "From the Archives [train operations and forms]," s.
Abbreviations denote the following features: g (graph), m (map), p (photograph), and s (sketch or non-photographic illustration).
