Human efficiency and levels of human intelligence / Henry Herbert Goddard. Goddard, Henry Herbert, 1866-1957. Louis Clark Vanuxem Foundation. Intelligence levels. Mental efficiency. 184.16 19 GOH Lectures sponsored by the Louis Clark Vanuxem Foundation and delivered at Princeton University in Apr. 1919. Reprint. Originally published: Princeton : Princeton University Press, 1920. London : Garland Pub, 1920. 1920. 1920 Text vii, 128 p. ; eng The History of hereditarian thought ; 17