"The Effect of vitamin A upon incidence and severity of colds among students. "; "Cameron, Hazel C. (Hazel Crabill), 1890-1943."; "Vitamin A--Therapeutic use.", "Cold (Disease)", "Vitamin A--Physiological effect.", "Cold (Disease)--Prevention."; "Cameron, Hazel C. (Hazel Crabill), 1890-1943."; "1935"; "Journal article reprint from: Journal of the American Dietetic Association, v.11:no.3 (1935:Sept.). "; ""; "P16717"; "pec"; "Vitamin A--Physiological effect.", "Vitamin A--Therapeutic use.", "Cold (Disease)--Prevention.", "Cold (Disease)"; "14256"; .