Table 1.

Summary of soil samplings.

Reference	Date of sampling	# Unique sites	# Profiles (total depth ≥15 cm)b
Olafson et al. (1957)	1948	17	0
Hakonson et al. (1973)	1972	8	8
Douglas (1978)	1973, 1974	88	11
Nyhan et al. (1976)	1976	4	2
Hansen and Rodgers (1985)	1977	54	17
McArthur and Miller (1989)a	1982	14	14

^aMost of these samples were remote from the areas impacted by Trinity fallout and served as control samples.

^bMost of the profile samples were taken in 5 cm increments; of the 38 profile samples, excluding the McArthur and Miller samples, 20 reached to only 15 cm while only 13 extended to ≥25 cm.