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Olaf E. Langland, Robert P. Langlais, John W. Preece ; consultants, Joan Gibson-Howell, Dorothea M. Cavallucci
Williams & Wilkins c2002 2nd ed
Available at 15 libraries
Olaf E. Langland, Robert P. Langlais ; consultants, Joan Gibson-Howell, Dorothea M. Cavallucci
Williams & Wilkins c1997 1st ed
Available at 5 libraries
[edited by] Robert P. Langlais, Olaf E. Langland, Christoffel J. Nortjé
Williams & Wilkins 1995
Available at 19 libraries
by Olaf E. Langland, Francis H. Sippy, Robert P. Langlais, with additional contributors
Thomas c1984 2nd ed
Available at 13 libraries
Olaf E. Langland, Robert P. Langlais, Charles R. Morris
Saunders 1982
by Olaf E. Langland and Francis H. Sippy
C.C. Thomas c1973
Available at 4 libraries
