The Cargille-Allen gem testing set :
comprising the refractoscope and Cargille specific gravity liquids.

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Cite this Export citation file
Related Names
Allen, Roy Morris, 1882-
R.P. Cargille Laboratories.
Language(s)
English
Published
New York, N.Y. : R. P. Cargille Laboratories, c1957.
Subjects
Precious stones > Testing.
Note
Includes index.
Apparently written by Dr. Roy M. Allen -- cf. p. 2 of cover.
Physical Description
vii, 36 p. : ill. ; 23 cm.
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