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by Warren, Robert Penn; Clark, William Bedford; Clark, William Bedford
by Warren, Robert Penn
by Warren, Robert Penn; Hendricks, Randy; Perkins, James A.; et al.
by Hood, Robert; Penn, Robin
by Penn, William; Fox, George; Barclay, Robert
by James F. McKenzie, Professor, Department of Public Health Sciences, Penn State Hershey, Professor Emeritus, Ball State University; Robert R. Pinger, Ball State University