Home › Authors › Ruth Gruhn 👤 Ruth Gruhn b. 1935 ยท 3 books Books by Ruth Gruhn New excavations at Wilson Butt New excavations at Wilson Butte Cave, South-Central Idaho 2006 Archaeological research at Calling Lake, northern Alberta 1980 The case for a formative horiz The case for a formative horizon in the intermediate area of nuclear America ... 1957
