Schuller, P. L. Cadmium, lead, mercury ... 1976 (a.e.) t.p. (Harold Egan, Laboratory of the Government Chemist, London, Eng.)

WW of Br. sci, 1971-72 (b. 23 Dec. 1922)

Royal Inst. of Chem. Register, 1967 (Egan, Dr. Harold)

International Symposium on Harmonization of Collaborative Analytical Studies (1981 : Helsinki, Finland). Collaborative interlaboratory studies in chemical analysis, c1982: t.p. (H. Egan, Lab. of the Gov't Chemist, London, UK)