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by Welsch, Robert L.; Vivanco, Luis A.
by Haviland
by Ember, Carol R.
by Monaghan, John; Just, Peter
by Miller, Barbara D.
by Havilland
by Lenkeit, Roberta
by Nanda, Serena; Warms, Richard L.
by Dr. Stephen A. Grunlan and Marvin K. Mayers