1909, Van Tubergen
|Van Tubergen 1909; 1913; 1`916; Backhouse 1909; Grulleman 1910; Amos Perry 1923; Stewart 1939;|
|Journal of the Royal Horticultural Society58: Pt 1, page 203 February 1933; Trials|
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-- Main.RPries - 2011-03-07