Article (magazine)  (Jan 1955)  Page(s) 24.  
 
Varieties Raised in America. All by Professor Saunders...
The "Roman Gold Group." Yellow, clear or almost clear , generally single.
'Arcadia,' (1942)

Article (magazine)  (Jan 1955)  Page(s) 56.  
 
Alphabetical Check List of Tree Peony Names In  Public Collections And/or Available in Nurseries 1954-1955
Lutea Hybrid, Yellow, 'Arcadia', (Saund. 1942), [Gardens] Scott Foundation

Magazine  (Mar 1954)  Page(s) 21.  
 
Hybrid Tree Peonies
...By far the most important work with these hybrids has been done by Prof. A. P. Saunders and his originations now number about 80. Their color range is truly remarkable. [...]
The list of hybrid tree peonies following is up to date as far as we could make it.
Originations of A. P. Saunders, Clinton, N.Y.
Hybrids of suggruticosa, lutea and Delavayi.
Arcadia, Single, palest yellow. 1942.

Magazine  (Sep 1944)  Page(s) 14.  
 
Tree Peony Supplement to the Manual
John C. Wister, Germantown, Pa.
Alphabetical Check List of Tree Peony Names, August 1944
Lemoinei hybrid (or Lutea hybrid); Reddish Yellow; ARCADIA (Saunders, 1942)
Name in Large Caps in Black Type indicates accepted names of varieties in American commerce 1944.

Book  (1944)  Page(s) 104.  
 
For next year 1945
Make a master list of tree peonies to be grafted & check them off as done.
For 1944
...Arcadia 321 4+9+2 [grafts]

Book  Page(s) 1.  
 
Arcadia 321 1939 5 grafts...1940 13 grafts ...Semidouble ...paler yellow, fine + enough different. Holds its flowers..

Book  Page(s) 43.  
 
Arcadia # 321 1944 Home Grounds Row 1 1 small....