Book  (2000)  Page(s) 636-637.  
 
‘Yorkshire’/KORbarkeit = Couvre-sol – blanc, remontant… Kordes, Allemagne, 1998. Ascendance inconnue.

Book  (8 May 1999)  Page(s) 636-637.  
 
Yorkshire (KORbarkeit) Groundcover. Kordes (Germany) 1998... small clusters of semi-double white flowers that open wide like saucers... This name had to be given to a white rose, because that became the emblem of the royal house of York in the early fifteenth century and has been associated with the county of Yorkshire ever since

Website/Catalog  (23 Oct 1998)  Page(s) 3, 6.  Includes photo(s).
 
Page 3: [Photo]
Page 6: Yorkshire (KORbarkeit) County Series... small clusters of semi-double white fragrant flowers... Kordes 1998.

Article (magazine)  (Jun 1998)  Page(s) 46.  
 
Yorkshire Introduced at Chelsea 1998 by Mattock's Roses... another addition to the County series of groundcover roses... the flowers are red.