Article (magazine)  (Jan 1955)  Page(s) 57.  
 
Alphabetical Check List of Tree Peony Names In  Public Collections And/or Available in Nurseries 1954-1955
Japanese, Pink, 'Howzan' or 'Hozan' (Treasure Mountain) (Jap. bef. 1934), [Gardens] University of Washington Arboretum, [Nurseries] William Gratwick