Chiefly ms text of lectures given, as follows:
'Felspars' August or September 1957;
'Discussion of replacements in the albite - anorthite series', no date;
'A Model for the Plagioclase Felspars' ('Substance of [Montreal and] Cardiff paper, verbatim but with slight amplifications - 7.4.57.'), together with related letter from John Kempster, 10 July 1954, enclosing typescript of his 'Cardiff paper' [Institute of Physics Spring Conference, April 1957, Cardiff];
H D Megaw and R E Newnham, 'The Structure of Celsian, BaAl2Si2O8', for the American Crystallographic Association, 1958;
Space Group paper, November 1958;
'Order and Disorder in the Felspars', for the Mineralogical Society, 1959;
Copenhagen 1960: schedule for the IMA Feldspar Symposium August 1960, with related letter from F Laves (Helen Megaw gave and presented several papers), together with the following: 'The Structure of Orthoclase', reported by H M; 'Structure of body-centred anorthite', by H Megaw, S Chandrasekhar and S G Fleet; 'The Structure of the Intermediate Plagioclase Felspars', given by H M; and 'Effects of temperature and composition in the plagioclases and other felspars', given by H M.