Seasonal variation : methods of measurement and tests of significance /
by R.J. Foote and Karl A. Fox.
- Washington, D.C. : U.S. Dept. of Agriculture, Bureau of Agricultural Economics, 1952.
- 16 p. ; 1952.
- Agriculture handbook / United States Department of Agriculture ; no. 48 .
- Agriculture handbook (United States. Department of Agriculture) ; no. 48. .