Hoernlé memorial lecture
South African Institute of Race Relations
by H. J. Van Eck
S.A. Institute of Race Relations 1953 2nd & rev. ed. Hoernlé memorial lecture 1951
Available at 1 libraries
by W.M. Macmillan
S.A. Institute of Race Relations 1949 Hoernlé memorial lecture
Available at 2 libraries