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by Glasser, Arthur F., Charles E. Van Engen, Dean S. Gilliland, and Shawn B. Redford
by Van Engen, Charles E.
by Charles E. Van Engen
by Shaw, Daniel R.; Engen, Van Charles E.; Sanneh, Lamin
by Glasser, Arthur F.; Van Engen, Charles E.; Gilliland, Dean S.; et al.
by Van Engen, Charles E.; Deiros, Norma
by Sterk, Vernon J.; Van Engen, Charles E.