Subjects include: correspondence with Blood Transfusion Centre relating to study on ABO blood groups and human sex ratio at birth. Correspondents: Folder 1: Peter Abbey, Dr. Margaret Abel, Prof. M. Abercrombie, Prof. E. P. Abraham, Administrative Staff Consultative Group (1975), Dr. Avindam Adam, Mr. C. B. T. Adams, M. E. Akam, Dr. Tom Alderson, P. Alexander, Dr. J. S. Allan, Dr. Hal...