Letter of Invitation from Dr Suttle to Professor Mallard inviting him to the National Conference on Biological Imaging Letter of Invitation from Dr Suttle to Professor Mallard inviting him to the National Conference on Biological Imaging, II. Clinical Aspect, October 16-18 1983 in the National Academy of Sciences, Washington, D.C, U.S.A with attached itinery. Professor Mallard has written a short handwritten note at the top of the page stating 'Please photocopy the postcard and send it in an airmail envelope to its address. Bring to me as soon as I get back. Thank you'. This copy is the original typescript. 18 July 1983