Book  (1967)  Page(s) 46.  
 
Some All-Canadian Roses
by Fred Blakeney, Victoria, B.C.
Mr. Percy Wright of Saskatoon, Sask., must be considered one of the foremost hybridizers of species and near species roses in North America. He has been working on these roses for many years, and knows the reactions of various hardy roses when crossed with species roses.
His objective has always been to produce worthwhile garden roses that are hardy enough to withstand the extremely low temperatures of the Prairies in winter. [...]
Here is a list of Mr. Wright's originations in chronological order of introduction:
1945 "Dorothy Evans", pale pink

Website/Catalog  (1949)  
 
"DOROTHY EVANS* - completely thornless, small, pale pink, semi-double or better; really a hybrid, but in effect a semi-double strain of Blanda. Fertile and useful for breeding."

Percy Wright Catalogue - Hardy and Semi-Hardy Roses - ca 1949 p.6