"Temperature movements of rhododendron petioles."; "Ritchie, Don."; "Rhododendrons.", "Rhododendrons--Frost resistance."; "Ritchie, Don."; "1942"; "Journal article reprint from: Proceedings, West Virginia Academy of Science, 1942. Also issued as: West Virginia University bulletin , 44:no.9 (1944:Mar.). "; ""; "P1157"; "pec"; "Rhododendrons--Frost resistance.", "Rhododendrons."; "14256"; .