National Bureau of Standards circular
U.S. Govt. Print. Off
NBS circular
Ernest F. Fiock and Carl Halpern
U. S. Government Printing Office 1951 National Bureau of Standards circular 509
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Vincent B. Phelan
U.S. G.P.O. 1950 National Bureau of Standards circular 489
by Claire Marton [and others]
U.S. Govt. Print. Off. 1950 National Bureau of Standards circular 502
by Deane B. Judd
U. S. Government Printing Office 1950 National Bureau of Standards circular 478
by Leon F. Curtiss
U.S. Dept. of Commerce, National Bureau of Standards , for sale by the Supt. of Docs., U.S.G.P.O. 1949 National Bureau of Standards circular 476
by F.B. Silsbee
U.S. Dept. of Commerce, National Bureau of Standards , for sale by the Supt. of Docs., U.S.G.P.O. 1949 National Bureau of Standards circular 475
U.S. Dept. of Commerce, National Bureau of Standards 1948 National Bureau of Standards circular 462
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by Louis Jordan
United States Government Printing Office 1936 National Bureau of Standards circular C409
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