RELIABILITY AND ADEQUACY OF FARM-PRICE DATA 65 
The most serious limitation of the monthly farm-price data is 
the shortness of the series, inasmuch as monthly farm prices date 
back only to about 1910. December 1 prices of crops and January 1 
livestock values, dating back to 1866-67, are helpful when a longer 
farm price series is needed, but unfortunately they do not include 
the prices of livestock products such as butter, milk, eggs, and wool. 
LITERATURE CITED 
(1) P>ecker, J. A., Flohr, L. B., Arner, G. B. L., Callander, W. F., and 
Juve, O. A. 
1924. agricultural statistics, bread grains. U. S. Dept. Agr. Year- 
book 1923 : 601-661. 
(2) Bercaw, L. O. 
1926. FACTORS AFFECTING PRICES. A SELECTED BIBLIOGRAPHY, INCLUDING 
SOME REFERENCES ON THE THEORY AND PRACTICE OF PRICE ANALY- 
SIS. U. S. Dept. Agr., Bur. Agr. Bcon. Bibliog. 14, 40 p. 
[Mimeographed.] 
(3) Bowley, A. L. 
1920. elements of statistics. Ed. 4, 459 p., illus. London and New 
York. 
(4) Strowbridge, J. W. 
1922. FARM AND TERMINAL MARKET PRICES '. WHEAT, CORN, AND OATS. 
U. S. Dept. Agr. Bui. 1083, 58 p. illus. 
(5) United States Department of Agriculture. 
1924. new index numbers of farm prices. U. S. Dept. Agr. Crops 
and Markets 1 (sup. 8) : 285. 
(6) 
1925. monthly marketing of crops. U. S. Dept. Agr. Crops and 
Markets 2 (sup. 4) : 114-115. 
(7) ■ 
1925. INCOME FROM AGRICULTURAL PRODUCTION IN THE UNITED STATES. 
CROP YEARS JULY-JUNE, 1910-1925. U. S. Dept. Agl*. Crops 
and Markets 2 (sup. 7) : 236-237. 
1925. MONTHLY MONEY INCOME OF FARMERS, 1919-192 5. U. S. Dept. 
Agr. Crops and Markets 2 (sup. 9) : 303. 
1925. INDEX NUMBERS OF FARM PRICES AND WHOLESALE PRICES OF NON- 
AGRICULTURAL commodities. U. S. Dept. Agr. Crops and Mar- 
kets 2 (sup. 6) : 171. 
(8) ■ 
(9) • 
(10) 
1925. monthly farm prices of wheat, 190S-1925. U. S. Dept. Agr. 
Crops and Markets 2 (sup. 12) : 407. 
(11) Yule, G. U. 
1922. an introduction to the theory of statistics. Ed. 6, 415 p., 
illus. London. 
(12) Zapoleon, L. B. 
1918. geography of wheat prices, summary of conditions affect- 
ing farm prices of wheat in different parts of the united 
states. U. S. Dept. Agr. Bui. 594, 46 p., illus. 
(13) 
1918. geographical phases of farm prices : corn. U. S. Dept. Agr. 
Bui. 696, 53 p., illus. 
(14) 
1919. GEOGRAPHICAL PHASES OF FARM PRICES : OATS. U. S. Dept. Agr. 
Bul. 755, 28 p., illus. 
