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De Graaff 1910; 1919; 1938; Barr 1923; 1928; |
Flower Grower 17: 4 , 197. April 1930 illustrated |
Scheepers 1929 catalog notes "Adrian Backer. Very large flowers of uniform purple-lilac. A beautiful novelty. $2.25 for 10, $20.00 per 100." |
Ainsley 1932; Wayside 1936; Delkin 1938 catalog notes "Adrian Backer. Large pink-lavender, easy forcer" |
Award of Merit Haarlem 1921; Award of Merit RHS 1931; Year Book the Iris Society of England 91: 1931; Bulbous trials 1933; |