Book  (2003)  Page(s) 153.  
 
Obtentions de Pierre Guillot:
1900. Mercedès (Rg)

Book  (1936)  Page(s) 470.  
 
Mercédès (HRug) Guillot 1900; light carnation-pink to light red, base and outer petals white, large, double, fine form, in clusters to 3-5, fragrance 6/10, growth 8/10, climbing habit, 1,50m, strongly spreading bush. Sangerhausen

Magazine  (Jul 1930)  Page(s) 90.  
 
Hybrides de R.rugosa ... Mercédès. — P. Guillot, 1900, fI. grande, pleine, rose oeillet tendre sur fond blanc.

Website/Catalog  (1926)  Page(s) 59.  
 
Rosa rugosa. Mercèdes (Guillot 1900). Vigorous. Large, double, fine form, fragrant, carnation-pink on white base, outer petals white.

Website/Catalog  (1925)  Page(s) 86.  
 
Rosa rugosa...Mercedes. Blooms carnation-pink on white base, double and fragrant ...Low-grafted garden plants 1 piece G.-M. [Gold-Mark] 1.25

[no longer listed in the 1929 catalogue]

Book  (1915)  Page(s) 42.  
 
"Rugosa Roses"
by H. R. Darlington, Hon. Secretary N. R. S.
Mercedes (Guillot, 1900). This is a very pretty flower in colour, which is a soft carnation pink on a white ground, and double. It is stated to be very hardy and vigorous, but curiously enough it is the only rugosa I have ever had that has not done well with me. My plant has never grown more than about 2 feet in height, with a slightly spreading habit. I shall have to make a new start with another plant. 

Website/Catalog  (1911)  Page(s) 6.  
 
Rosiers Rugosa
Mercédès, fleur rose œillet sur fond blanc, grande, pleine, odorante.

Book  (1910)  Page(s) 275.  
 
Mercedes Rugosa... a new shade of colour in this group. soft rosy pink on a white ground. Flowers large, full, finely shaped, and sweet...

Magazine  (1904)  Page(s) 89.  
 
[among a list of rugosas] Mercedes, light pink, White outer petals, well double, strong fragrance.

Book  (1902)  Page(s) 148.  
 
Among the roses grown at L'Haÿ in 1902.] Race des Rosiers Hybrides du Rugosa. No. 5514 (P. Guillot 1901) rose oeillet fond blanc