A photograph print showing the Union Pacific (UP) 284, 2-8-0, on mixed freight Train #386, in Payette River Canyon nearing Smith's Ferry, ID, 7 cars.

A photograph postcard showing Union Pacific (UP) 6043, 2-8-0, on mixed train No. 385, about to enter a tunnel above above Smith's Ferry, ID, 10 cars, 15 mph.

A photograph postcard showing Union Pacific (UP) 6043, 2-8-0, on mixed train No. 385, below Cabarton, ID, 10 cars, 15 mph.

A photograph postcard showing Union Pacific (UP) 284, 2-8-0, on mixed train No. 386, running downgrade, plowing snow above Smith's Ferry, ID, 7 cars, 30 mph.

Photograph of the Series 90-S Mobile Spar. According to author Eric Orlemann, "the Mobile Spar was a diesel-electric transporter equipped with a folding 130-foot guy wire tower." It was built for hauling lumber up steep slopes. Only one unit was built and sold to a lumber company in McCall, Idaho.

From introduction: The Bear Valley district is situated in southwestern Idaho, in the drainage of the Middle Fork of the Salmon River (see fig. 1). The placer deposits were drilled by the U. S. Bureau of Mines in 1951 and 1952 to determine their content of monazite and "radioactive black minerals" (here referred to loosely as "radioactive blacks"). The purpose of the study outlined here was to provide a geologic background for an understanding of the origin and distribution of the placer minerals.

Report issued by the Bureau of Mines on the geochemical anomalies found in the gold-antimony deposits near Stibnite, Idaho. Many samples were collected and tested through an atomic absorption method. This report includes a map.