Proceedings of Symposium on the Earth's Gravitational Field and Secular Variations in Position. Theatre B, Sciences Building, The University of New South Wales, Sydney, 26-30 November 1973 - Mather, R. S. (Ronald S.); Angus-Leppan, P. V. (Peter Vincent), 1930- (School of Surveying, University of New South Wales, 1974)