We thank Arthur Klotz, Customer Services Branch, U.S. Postal Service, for assistance in 
correcting errors, and Noah Sealock for programing the computer tables. 
References 
Carney, S. M., M. F. Sorensen, and E. M. Martin. 1978. Duck stamps sold within States and 
counties during sales years 1966-67 through 1975-76. U.S. Fish Wildl. Serv., Spec. Sci. 
Rep.--Wildl. 210. 46 pp. 
Schroeder, L. D., S. M. Carney, and E. M. Martin. 1974, Distribution of duck stamp sales 
within States during fiscal years 1962-71. U.S. Fish Wildl. Serv., Spec. Sci. Rep.--Wildl. 
180. 46 pp. 
