"The Relation of manganese to internal bark necrosis of apple. "; "Clulo, Genevieve Berg.", "Berg, Anthony."; "Apples--Diseases and pests."; "Clulo, Genevieve Berg.", "Berg, Anthony."; "1946"; "Journal article reprint from: Science, v.104:no.2699 (1946:Sept.20). "; ""; "P17011"; "pec"; "Apples--Diseases and pests."; "14256"; .