Harper, A E Human protein requirements. Problems of maintaining nitrogen balance on a low income. [electronic resource] - The Alabama journal of medical sciences Oct 1984 - 389-94 p. digital Publication Type: Journal Article ISSN: 0002-4252 Subjects--Topical Terms: AdolescentAdultAmino Acids--administration & dosageChildChild, PreschoolDietary Proteins--administration & dosageHumansInfantNitrogen--metabolismNutritional RequirementsPoverty