Book  (1936)  Page(s) 768.  
 
Zwart, Secretaris (HT) van Rossem 1918; G. MacArthur X Lyon Rose; glossy pink, reverse silvery pink, large, double, fine form, solitary or up to 3, floriferous, repeats well, growth 6/10. Sangerhausen

Website/Catalog  (1929)  Page(s) 30.  
 
Everblooming Roses
The so-called Everblooming Roses include the Hybrid Tea and Pernetiana groups. They do not bloom all the time, but if kept healthy and growing steadily, one crop of flowers succeeds another at brief intervals.
Secretaris Zwart. Hybrid Tea. (G. A. Van Rossem, 1918.) Very attractive flowers of bright rose and salmon, shaded with silvery tints on reverse of petals. Plants are of notable vigor and liberal in blooming. The foliage is glossy and resistant to disease.
When well-grown, the blooms are enormous, particularly in late autumn.

Website/Catalog  (1925)  Page(s) 6.  
 
SECRETARIS ZWART, vivid pink, reverse darker, bud lighter

Website/Catalog  (1924)  Page(s) 41.  
 
General List. (124) Secretaris Zwart (HT. Rossem 1922). F.2. .....Mildew-proof, but unless well grown the blooms droop slightly. Everywhere.

Website/Catalog  (1923)  Page(s) 40.  
 
Hybrid Tea Roses ....  Secretaris Zwart (Van Rossem, 1918). Large bloom, lilac-pink shaded with salmon. Floriferous. Cerificate first class Nederl. Maatschappij voor Tuinbouw en Plantkunde. (General Mac Arthur X Lyon Rose.)

Website/Catalog  (1922)  Page(s) 13.  
 
Novelty Roses 1922.
Secretaris Zwart (HT.) (Rossem) Growth, vigorous and very free flowering; flowers are large and attractive; colour, bright rose, reverse of petals silvery rose. Awarded the first-class certificate, Amsterdam, 1919. 4/- each.

Website/Catalog  (1921)  Page(s) 4.  
 
Hybrid Tea Roses.
Secretaris Zwart (Rossem)—Growth vigorous and very free flowering, flowers are large and attractive, colour bright rose, reverse of petals silvery rose. Awarded the first class certificate, Amsterdam, 1919.