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30. Orb!, J. S,* ; TormaIdehyd"f pp. 15542, J. A, Barih, Leipzig, 1508.
31. Oriov, 1I.,' I Rm. PAji,Ctoi. k, 39, S55^S, 1023-44,1414-39 (190;);40, 796-9 (1808).
32. Sabatier, P, and Mailhe, I, .4M. cfo. ntjj. i' 1 ,21,344 (191.
33. Thomas, M.D,/..!». Cta.&c.,ti, S"'W
31. Tollens, B.t Ber., 15,1B29
3a.To!lenslB,Bp.)H,213W,:iSf.
3i Trillii, A, French Patent 199,919 '1559'; German Patent 5.5,176 '1SS91
37, Ullmann, F,, "Enzyklopadie der techni^chen Chemie 11 ,2nd Ed., pp. 416-7, Urban k Sckanenberg,
Berlin-Vienna, 1930,
35, United States Dept. Commerce, Bureau of Foreign and Domestic Commerce, "Statistical Abstract of the
United States", page S27r Washington, United States Government Printing Office (1929),
39.VolhardfJ.,inti.,l'M2S-13o(lS;o:i.
40, Walker, J. C, (to Empire Oil k Refining Co,), U, & Patents 2,M7,lio-6 (1935),
41, Walker, J, C, (to Empire Oil k Refining Co.\ U. 8. Patent 2,042,134 (1935).
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43. Walker, J, C, (to Cities Service Oil Company! U. S. Patent 2,158,88$ f M
44.Walker,J,F,J.Cbi,a,10,54f]-51«l
45, Wiezevich, P. J, and Frolich, P, £, M. % Cta, %, 2«7 m ,
* These references are by the same author. The discrepancy in spelling is due
to the difference in English and German transliteration from Russian.