Book  (11 Jun 1993)  Page(s) 42.  
 
['Gruss an Bayern' x unknown seedling] x R. rugosa seedling. Kordes (Germany) 1983. Description... Some resemblance to 'Robusta' but with larger (about 4 1/2-inch) and fuller blossoms of the same vivid scarlet-red.

Magazine  (1986)  Page(s) Issue 4, p. 312.  
 
Rheinaupark (shrub), Koreipark, (Gruss an Bayern x Seedling) x Rosa rugosa, 1983