52. Dr. Martin M. Cummings Publication: [New York?] : [Modern Medicine Publications?], 1968 Subject(s): PhysiciansCummings, Martin Marc, 1920-2011.National Library of Medicine (U.S.)
53. Test-tube studies of a self-duplicating RNA molecule Publication: [Bethesda, Md. : Medical Arts and Photography Branch, National Institutes of Health], 1968 Subject(s): RNAGene Duplication