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by Gibbs, Alfred P.; Harlow, R. Edward; Harper, Harold M.; et al.
by Angle, Kurt; Harper, John
by Harper, Peter; Madsen, Chris; Light, Jeremy; et al.
by Harper, John W.; Allen, Douglas S.
by Massarotti, Tony; Harper, John
by Harper, John Jay
by Rowland, Benjamin M.; Allin, Dana H.; Behr, Timo; et al.
by Kay Elder , Brian Dale , With contributions by Yves Ménézo , Joyce Harper , John Huntriss
by Harper, John