550 ANNUAL KEPORT SMITHSONIAN INSTITUTION, 1939 



214. A graphic summary of farm machinery, facilities, roads, and expenditures. 



Department of Agriculture, Miscellaneous Publication No. 264, July 1937. 



215. A graphic summary of farm labor and population. Department of Agri- 



culture, Miscellaneous Publication No. 265, November 1937. 



216. A graphic summary of the number, size, and type of farm and value of 



products. Department of Agriculture, Miscellaneous Publication No. 266, 

 October 1937. 



217. A graphic summary of farm crops. Department of Agriculture, Miscel- 



laneous Publication No. 267, March 1938. 



218. Automobiles: introduction. 



219. Motorcar. Encyclopaedia Britannica, vol. 15, pp. 880-901. 



220. Automobile facts and figures. Automobile Manufacturers' Association. 



1938 edition. 



221. A chronicle of the automotive industry in America 1892-1936. Eaton Mfg. 



Co., Cleveland, Ohio. 



222. Aviation : introduction. 



223. Aero engines. Encyclopaedia Britannica, vol. 1, pp. 237-242. 



224. Aeronautics. Encyclopaedia Britannica, vol. 1, pp. 242-250. 



225. Aeroplane. Encyclopaedia Britannica, vol. 1, pp. 250-258. 



226. Civil aviation. Encyclopaedia Britannica, vol. 2, pp. 801-812. 



227. The Aircraft Yearbook for 1938. Aeronautical Chamber of Commerce of 



America, Inc. 



228. TWA timetable, July 1, 1938. 



229. United Airlines timetable, July 1, 1938. 



230. Eastern Air Lines timetable, August 15. 1938. 



231. American Airlines timetable, August 1, 1938. 



232. Northwest Air Lines timetable, August 1938. 



233. Pan American timetable, July 1, 1938. 



234. Ajr France timetable, summer 1938, from March 27 to October 1. 



235. Imperial Airways timetable, July 1938. 



236. Swissair timetable, summer 1938. 



237. Swedish Air Lines timetable, March 27-October 1, 1938. 



238. Canadian Colonial Airways, July 1, 1938. 



239. Ships and shipping. Encyclopaedia Britannica, vol. 20, pp. 505-563. 



240. Chemical industry : introduction. 



241. The chemical elements and their discoveries. Fisher Scientific Co., Jan- 



uary 1936. 



242. Chemistry. Encyclopaedia Britannica, vol. 5, pp. 355-410. 



243. Applied chemistry. Encyclopaedia Britannica, vol 5, pp. 410-412. 



244. A World of Change. An address by Dr. Edward R. Weidlein, President of 



the American Chemical Society, Rochester meeting, September 9, 1937. 



245. Industrial Chemistry, by William Thornton Read. John Wiley & Sons, 



New York, 1933. 



246. Coal and coal mining : introduction. 



247. Coal and coal mining. Encyclopaedia Britannica, vol. 5, pp. 868-912. 



248. The formation and characteristics of Pennsylvania anthracite. The Anthra- 



cite Institute. 



249. Communications : introduction. 



250. Telegraph. Encyclopaedia Britannica, vol. 21, pp. 880-898. 



251. Telephone. Encyclopaedia Britannica, vol. 21, pp. 894-904. 



252. Food industries: introduction. 



253. Food preservation, service, and supply. Encyclopaedia Britannica, vol. 9, 



pp. 457-460. 



254. Canning. Encyclopaedia Britannica, vol. 4, pp. 748-751. 



