Book  (Apr 1999)  Page(s) 319.  
 
Pearl Queen Wichurana. Van Fleet/Conard & Jones 1901. The author cites information from different sources... large perfectly double flowers, clear pearl white, finely tinted with deep rose...

Book  (1936)  Page(s) 548.  
 
Pearl Queen (hybrid wichurana) Dr. van Fleet 1898; Wich. X Mrs. de Graw; ?

Magazine  (29 Jul 1911)  Page(s) 362.  
 
The Parentage of Roses.
The following list of the world's Roses and their parentage has been compiled by Mr. Robert Daniel, 38 Russell Road. Fishponds, Bristol, and by his kind permission we are enabled to publish it...
Pearl Queen... Hybrid Wichuraiana, Conard, 1899, R. wichuraiana X Champion of the World

Book  (1911)  Page(s) 68.  
 
The Wichuraiana Hybrids.
The following list includes most of the best Wichuraiana Roses to date (1910):
Pearl Queen. — A large double bloom, with blush centre, borne in trusses of from five to seven.

Book  (1906)  Page(s) 177.  
 
Doctor Van Fleet, of Little Silver, N.J., is credited with these: ...Pearl Queen, Wichuraiana X Mme. Degraw. Vigorous grower, long canes and large foliage; flowers large and very double; pure white with blush centre (1897).