Tables presented at the meeting of Haemophilia Centre Directors Sheffield, Thursday 31st January 1974 re Incidence of classical haemophilia A, Sheffield region Registered Cases confirmed by clinical and laboratory diagnosis, Treatment with fresh blood, fresh frozen plasma or cryoprecipitate issued from B.T. Centre over last 15 years, Analysis of Treatment Patterns, Sheffield Region Cryo Bank Stocks, Replacements second six months of 1973 - all material freely available, and Sheffield Cryo before and after Factor VIII Levels.