by Aldridge, Brenda M.T.A;
Hicks, Brendan J.
by Schouten, C.J;
-- Water Quality Centre (Hamilton, N.Z.)
by Howie, William Russell.
-- New Zealand Water and Soil Division
by -- New Zealand Ministry of Works;
Poverty Bay Catchment Board;
New Zealand Association of Soil Conservators;
National Water and Soil Conservation Organisation (N.Z.) -- Seminar on the Preventation and Control of Mass Movement and Gully Erosion (1973 : Gisborne, N.Z.).