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401. Radiation Laboratory, Massachusetts Institute of Technology; Reports. M-217. Instructions for types TXF-17GA, TFX-19GA, TFX-30EC, TFX-31EC, model 51 and similar types of micrometer frequency meters. Supplement to Report M-217 on frequency meters TFX-40GA, TFX-41Ga, and TFX-43EC. n.d.

403. Ailes d'Amerique. n. p. n. d.

404. Annual report as of June 30, 1947.

408. Circular A-1, revised; Aug. 3, 1948.

409. Circular A-24; Mar. 19, 1948.

410. Circular A-25; May 7, 1948.