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Your search keyword '"Helm, C."' showing total 15 results
Start Over Author "Helm, C." Publication Year Range More than 50 years ago
15 results on '"Helm, C."'

2. Colorometric detection of ethylene glycol vapor

Author

Helm, C, Mosier, B, and Verostko, C. E

Subjects
Physical Sciences
Abstract

Very low concentrations of ethylene glycol in air or other gases are detected by passing a sample through a glass tube with three partitioned compartments containing reagents which successively convert the ethylene glycol vapor into a colored compound.

Published
1970

9. Yellowstone National Park. Department Of The Interior General Land Office, Fred Dennett, Commissioner. Compiled from the official Records of the General Land Office, U.S. Geological Survey and other sources under the direction of I.P. Berthrong, Chief of Drafting Division G.L.O. 1911. The Eckert Lithographing Company, Washington, D.C. Compiled and drawn by I.P. Berthrong. Lettered by C.J. Helm.

Author

General Land Office, Berthrong, I.P., and Helm, C.J.

Subjects
Washington, D.C., Yellowstone National Park, Wyoming
Abstract

A beautiful full color topographical map. Relief shown by shading. Includes legend., A beautiful full color topographical map.

Published
1911

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