A monograph of azaleas : Rhododendron subgenus Anthodendron Wilson, Ernest Henry, 1876-1930 creator Rehder, Alfred, 1863-1949 contributor text book Cambridge The University Press 1921 1921
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ENG The azaleas of the old world / by E.H. Wilson -- The azaleas of North America / by A. Rehder. Azaleas QK495.R47 W5 Publications of the Arnold Arboretum, no. 9 https://www.biodiversitylibrary.org/bibliography/51369 21010414 10.5962/bhl.title.51369