Book  (1960)  Page(s) 262.  
 
MODESTE GUERIN (Guerin, 1845), D. Dark rose-pink, ...

Website/Catalog  (1926)  Page(s) 79.  
 
Modeste Guérin, pourpre rosâtre, centre rose

Book  (1922)  Page(s) 56.  
 
Modestes Guerin, of Paris, introduced some good varieties such as Modeste Guerin, in 1837...

Book  (1917)  Page(s) 97.  
 
Modeste Guerin. Large compact flower. Deep bright pink, solid colour throughot. Guerin, 1845. Bomb. Deep pink. Large. Midseason. Fragrant. Medium height. Strong, erect. Free bloomer. Fine foliage. Garden and cutting.

Book  (1907)  Page(s) 26.  
 
Here is my list of the best 24 varieties of peonies for cut flowers: Baroness Schroeder, Festiva Maxima, Golden Harvest, Madam de Verneville, Duke of Dorchester, Belle de Nancy, Mt. Blanc, Couronne d'Or, Pottsii Alba, Livingstone, M. Geissler, Madame Emil Lemoine, Floral Treasure, Richardson's Grandiflora, Richardson's Rubra Superba, La Tulipe, Marie Crousse, Modeste Guerin, Marie Lemoine, Mons. Dupont, Prince Imperial, Sunbeam, Louis Van Houtte, L'Esperence.
C. S. Harrison.

Book  (1907)  Page(s) 44.  
 
Modeste Guerin. Guerin, 1845. Though an old variety it is yet difficult to supply the demand. Bright carmine, with purple center; fragrant and fine. Medium.

Book  (1904)  Page(s) 3.  
 
Double Herbaceous Paeonies. ...Series C. 75 cents each.
Modesty Guerin, cherry rose ; fine.

Website/Catalog  (1890)  Page(s) 30.  
 
Double Herbaceous Pæonies.
General Collection.
Modeste Guerin, cherry rose.

Website/Catalog  (1888)  Page(s) 28.  
 
HERBACEOUS HARDY JUNE-FLOWERING CHINESE DOUBLE PAEONIAS. VARIETIES OF ALBIFLORA.
Modeste Guerrin, rose-magenta, rose-scented, 1/6

Magazine  (16 Jan 1885)  Page(s) 31.  
 
Choix de Pivoines Herbacées de Premier Ordre. [par MM. Eugene Verdier et Edouard André]
*Modeste-Guérin (Modeste Guérin). Fleur extra-grande à grands pétales entremêlés de plus étroits, beau rose foncé vif.

Translation: the extra-large flower is a fine, deep vivid rose, and has larger petals intermingling with the narrower ones. The varieties marked * should not be missing from any well-appointed garden.