Hydraulic placer mining on the Boise River near Twin Springs in Elmore County, Idaho. Photo shows a miner operating a hydraulic giant on a hillside while another miner is inspecting the runoff in the ground sluice below.
Postal service-Idaho-History-Sources. --Covers (Philately)-Idaho. --Letterheads-Idaho.
Idaho covers, letterhead, and franked envelopes. Included are examples of Ada and Alturas counties' letterheads, franked envelopes from express companies operating in Idaho's mining districts, Idaho post office covers, and letterheads from the...
Page 20: Bun Phay, left, is operating a Magnuflux machine
used to detect minute cracks in vital engine parts thus cutting possible
engine failure to a minimum. Three of the mechanics have taken special
training in the operation of this machine from...