By Katz, Arnold M
By C.B. Besant, C.W.K. Lui
By Raymond J. Roark, Warren C. Young
By Ian F. Tannock, Richard P. Hill
By Hecht, Eugene, Zajac, Alfred, Zajic, A.
By Cubbitt, J.M., Henley, S.
By Collard, Ron
By Dornbusch, Rudiger, Fischer, Stanley
By Fry, L.
By Siegel, Sidney
By Torrington, Derek, etc.
By Atwood, Jim D
By Hodge, E.D., Wood, Bertram Gerald J.
By Peterson, James L., Silberschatz, Abraham
By James, Michael
By Great Britain: Department of the Environment
By Coulson, J.M., Richardson, J.F.