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by Willig, Michael R.; Walker, Lawrence R.
by Walker, Lawrence R.; Landau, Frederick H.
by Prach, Karel; Walker, Lawrence R.
by Lawrence R. Walker , Roger del Moral
by Roger del Moral , Lawrence R. Walker
by Edited by Klaus Mehltreter , Lawrence R. Walker , Joanne M. Sharpe
by Lawrence R. Walker , Peter Bellingham