Book  (Sep 1993)  Page(s) 236-237.  Includes photo(s).
 
Katherine Kordes Large-flowered... merely a step on the road that led to 'Crimson Glory', its grandchild... it lacks scent... Parentage: ('Willowmere' x 'Sensation') x 'Madame Caroline Testout'...

Book  (Apr 1993)  Page(s) 81.  
 
Hybrid Tea, dark red, 1930, ('Mme. Caroline Testout' x 'Willowmere') x 'Sensation' (Hill); Kordes; Dreer; H&S. Bud long, pointed, blood-red, shaded black; flowers dark scarlet, double, large; fragrant; foliage dark (blood-red when young), leathery; very vigorous growth.

Book  (1985)  Page(s) 101.  
 
On studying the descendants of Caroline, [Wilhelm Kordes II] thought he detected the entry he wanted in a pink rose called 'Superb', introduced by Evans of Brighton in 1924. He crossed 'Superb' with 'Sensation', a red rose introduced in 1922 by Joseph H. Hill Co. of Richmond, Indiana. Most of the seedlings were pink, but one was ruby red, giving him the break he had sought. He named it 'Cathrine Kordes' and introduced it in 1929...

Book  (1976)  Page(s) 61.  
 
According to Suschkow, also the sorts 'Contrast', 'Ramon Bach', 'Leni Neuss', 'Kathrine Kordes' and especially 'Staatspräsident Päts' are suitable components for hybridisation, especially the last sort produces as seed plant vigorous shrubs with long, straight canes, which end with a bloom at the tip.

Book  (1971)  Page(s) 83.  
 
Nigel Raban. The Men Behind the New Roses. Wilhelm Kordes.
When he first started hybridizing after the first world war, he used 'Mme. Caroline Testout', then the most popular rose in Germany for cutting, as the seed parent. By using 'General Jacqueminot' as the pollen parent, he was hoping to produce a red "Testout", but the first crosses were valueless and it was not until 1930 that he launched 'Cathrine Kordes' ('Mme. Caroline Testout' x 'Willowmere') x 'Sensation', bright red in colour and similar to "Testout" in form.

Website/Catalog  (1959)  Page(s) 68.  
 
'Catherine Kordes’ (HT) Double, scarlet, varying to pink.

Website/Catalog  (1959)  Page(s) 2.  
 
‘Cathrine Kordes’. A splendid cerise to red rose of excellent shape with a high-pointed centre. Growth is vigorous and the flowers are very freely produced.

Book  (1956)  Page(s) 126.  
 
F. J. Melville, Tasmania. ….but have some doubts about the form of ‘Opera’ which reminds me of ‘Cathrine Kordes’ so far. The outline is rarely circular as the petals open unevenly.

Website/Catalog  (1953)  Page(s) 2.  
 
‘Catherine Kordes’ A fine, vigorous grower; large blooms, cerise scarlet shaded crimson. Tea scent.

Book  (1952)  Page(s) 118.  
 
A. E. Lake, Western Australia ….‘Cathrine Kordes’, who never can make up her mind whether she wants to be red or pink – is continually in the limelight.