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    Pedigree Chart of Contour, 1 W-W, Guy L. Wilson, Northern Ireland, UK, 1946

N. abscissus  
Weardale Perfection  
Seedling
Duke of Bedford  
Askelon
King Alfred  
Seedling
Glory of Noordwijk
Nevis  
1 W-W seedling
Contour
Empress  
Madame de Graaff  
N. albescens
Seedling
unknown
Diva
Naxos