Cook, "Exploring the McKelvey Brothers Logging Railroad, Part III: Potts Gap and Meadow Gap," m. Huston, "Laying Track on the McKelvey Brothers Line" (oral history). R. Keller and V. Keller, "Coles Valley Branch," m, p. V. Keller, "Coles Valley Depot: Building the HO-Scale Kit from Furnace Hills Depot," review, p, s. Padgett, "From Coal to Glory: The History of the Huntingdon & Broad Top Mountain Railroad and Coal Company, vol. 2, 1874-1900, by Baughman and Morgan," review; "Huntingdon County, Pennsylvania: An Inventory of Historic Engineering and Industrial Sites, by Shedd," review. Riddlebaugh, "Hip Roof on the Roundhouse?" s. Zimmerman, "EBT's Master Timekeeper." p, s.
Abbreviations denote the following features: g (graph), m (map), p (photograph), and s (sketch or non-photographic illustration).
