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411. Petroleum. Separation of 1,2,4-trimethylcyclohexane and isononane from midcontinent petroleum [with list of references]; by Joseph D. White, and Augustus R. Glasgow, jr.

Corporate/Agency Authors:: National Bureau of Standards and Commerce Department
Publisher:: National Bureau of Standards
Date:: [1939.]
SuDoc number:: C 13.22/a:1173

412. Petroleum. Summary of investigation of composition of midcontinent petroleum distillate, boiling between 100° and 130° C.; by Robert T. Leslie.

Corporate/Agency Authors:: National Bureau of Standards and Commerce Department
Publisher:: National Bureau of Standards
Date:: [1939.]
SuDoc number:: C 13.22/a:1174

413. Photogrammetric mapping. Relation of camera error to photogrammetric mapping; by Irvine C. Gardner.

Corporate/Agency Authors:: National Bureau of Standards and Commerce Department
Publisher:: National Bureau of Standards
Date:: [1939.]
SuDoc number:: C 13.22/a:1177

414. Potentiometer. Method of reducing effect of disturbances in galvanometer branch of potentiometer circuit; by Frank Wenner.

Corporate/Agency Authors:: National Bureau of Standards and Commerce Department
Publisher:: National Bureau of Standards
Date:: [1939.]
SuDoc number:: C 13.22/a:1194

415. Potentiometer. Potentiometer for measuring voltages of 10 microvolts to accuracy of 0.01 microvolt; by Ray P. Teele and Shuford Schuhmann.

Corporate/Agency Authors:: National Bureau of Standards and Commerce Department
Publisher:: National Bureau of Standards
Date:: [1939.]
SuDoc number:: C 13.22/a:1195

416. Printing tests of experimental book papers; by Merle B. Shaw and Robert H. Simmons.

Corporate/Agency Authors:: National Bureau of Standards and Commerce Department
Publisher:: National Bureau of Standards
Date:: [1939.]
SuDoc number:: C 13.22/a:1180

417. Radio communication. On accuracy of radio field-intensity measurement at broadcast frequencies; by Harry A. Diamond, Kenneth A. Norton, and Evan G. Lapham.

Corporate/Agency Authors:: National Bureau of Standards and Commerce Department
Publisher:: National Bureau of Standards
Date:: [1939.]
SuDoc number:: C 13.22/a:1156

418. Radio meteorograph. Improved radio meteorograph on Olland principle; by L. F. Curtiss, A. V. Astin, L. L. Stockmann, and B. W. Brown.

Corporate/Agency Authors:: National Bureau of Standards and Commerce Department
Publisher:: National Bureau of Standards
Date:: [1939.]
SuDoc number:: C 13.22/a:1169

419. Radium exposure meter; by Leon F. Curtiss.

Corporate/Agency Authors:: National Bureau of Standards and Commerce Department
Publisher:: National Bureau of Standards
Date:: [1939.]
SuDoc number:: C 13.22/a:1246

420. Reflux regulator and head for laboratory rectifying columns [with list of references]; by Frederick D. Rossini and Augustus R. Glasgow, jr.

Corporate/Agency Authors:: National Bureau of Standards and Commerce Department
Publisher:: National Bureau of Standards
Date:: [1939.]
SuDoc number:: C 13.22/a:1249

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