Secretary to the Librarian, Royal Society of Medicine, Wimpole Street, London Is returning May 1963 issue of <i>Progress in Cardiovascular Disease<\i> - not issue required - made mistake in not giving full reference - gives references to articles required in<i>Postgraduate Medicine<\i>, <i>Journal of the Royal College of Surgeons of Edinburgh<\i> and in <i>Progress in Cardiovascular Disease<\i>. 3 January 1964