Book  (1991)  Page(s) 62.  Includes photo(s).
 
The scent [of Veilchenblau] is rosy-sweet whereas Snowdrift raised four years later, has a scent of fresh green apples inherited from its R. wichuraiana parent. These two ramblers make a good pair and require the same pruning.  If you have time, remove all the old flowering wood immediately the blooms have faded, if not, as soon as you can, and tie up the young new shoots.  
[Note photo is a distance one of Veilchenblau and Snowdrift on a wall]

 

Book  (1936)  Page(s) 670.  
 
Snowdrift (hybrid wichurana) Wm. Paul 1913; white

Website/Catalog  (1914)  Page(s) 7.  
 
Hybrid wichuranas. Snowdrift (Wm Paul 13), pure white, double, 20-30 on one cane