FERRELL, Mallory Hope; HAUCK, Cornelius W. & MYERS, Rex C.
Idaho Montana Issue: Utah & Northern - The Narrow Gauge that Opened a Frontier; OSL&N - The Oregon Short Line Era; Union Pacific, Montana Division; Gilmore & Pittsburgh
Colorado Rail Annual No. 15
KRATVILLE, William W.& BUSH, John E.
The Union Pacific Type - The story of Union Pacific's 3-cylinder power
Volumes One & Two
Very fine study of the 4-12-2 Union Pacific locomotives, illustrated throughout with photographs and diagrams in two substantial volumes.