1. The causes of blindness in England and Wales;Sorsby;Medical Research Council Memorandum,1950
2. Occurrence of blindness in Norway;Hoist;Am. J. Ophth.,1952
3. Battle against blindness;Lancaster;J.A.M.A.,1951
4. Blindir menn a Islandi;Sveinson;Heilbrigt lif.,1944
5. Prevalence and causes of blindness in Iceland;Bjornsson;Am. J. Ophth.,1955