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Ocher and Ochery Earths
Report about ocher or ochery earth, "a natural mineral pigment composed largely of clay permeated with hydrated iron (ferric oxide)" (p. 2). It includes information about the uses of choer, substitutes, artificial ocher, mining and local deposits, import and export of ocher, and related information.
Date:
May 1929
Creator:
Santmyers, R. M.
System:
The UNT Digital Library
Air traffic
This report presents a recounting of the steps taken by France to establish national and international regulation over air traffic.
Date:
May 1922
Creator:
Sudre, G.
System:
The UNT Digital Library