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by Ritchie, L. David
by David A. Ritchie
by Ritchie, David
by David and Deborah Ritchie
by Ritchie, David; Gates, Alexander E.
by David and Deborah Ritchie; revised and updated by Jennifer Kaylin
by Ritchie, David M.
by David and Deborah Ritchie; revised and updated by Joan and Tom Bross