Exploratory study of the principal soil groups of Alaska,
by Charles E. Kellogg and Iver J. Nygard.
- Washington [U.S. Govt. Print. Off.] 1951.
- iii, 138 p. illus., maps (1 fold. col. in pocket) 24 cm.
- United States. Dept. of Agriculture. Agriculture monograph no. 7 .
- United States. Department of Agriculture. Agriculture monograph no. 7. .