Book  (2008)  Page(s) 40.  Includes photo(s).
 
Graph 3 Parent Roses derived from the Hybrid Rugosa Max Graf...
Svejda selection G49, a tetraploid seedling derived from 2 cycles of open pollination of Max Graf. [Diagram shows G 49 = G12 open pollinated]

Magazine  (1995)  Page(s) 146.  
 
In an article entitled "'George Vancouver' Rose" by Ian S. Ogilvie and Neville P. Arnold, HortScience (1995) 30(1), p. 146, the pedigree of 'George Vancouver' appears in Figure 1. G49 is an open pollinated seeding of G12.