Website/Catalog  (1938)  Page(s) 13.  
 
Once-blooming climbers....Weigand's Crimson Rambler (multiflora) (Weigand 04). More floriferous, darker and earlier than Crimson Rambler. (Synonym: "Non plus ultra"), hardy.

Book  (1936)  Page(s) 516.  
 
Non plus ultra (multiflora) Weigand 1903; Crimson Rambler X Bl. Rabatel; dark crimson, small to medium-size, semi-double, in clusters of 50-100, especially floriferous, growth 8/10, climbing, 3m., Sangerhausen

Book  (1936)  Page(s) 596.  
 
Rambler, Weigand's Crimson (multiflora) Weigand 1904; Bl. Rabatel X Crims. Rambler; crimson, medium-size, semi-double, cluster-flowered, growth 8/10, climbing, 3m. = Non plus ultra, Sangerhausen

Book  (1933)  Page(s) 202.  
 
NON PLUS ULTRA (Weigand's Crimson Rambler). L. Weigand, 1904. Much like Crimson Rambler but darker and earlier.

Magazine  (Jun 1929)  Page(s) 72.  
 
Non plus Ultra (Ch. Weygand, 1904), Cr. Rambler x Blanche Rebatel), fleur moyenne, demi-pleine, cramoisi.

Website/Catalog  (1929)  Page(s) 54.  
 
Hardy Climbing Roses
Non Plus Ultra. Hybrid Multiflora. (L. Weigand, 1904.) Small, dark crimson flowers in clusters. Strong grower and hardy.
Midseason. Often called Weigand’s Crimson Rambler. Earlier and more free flowering than the original Crimson Rambler, with darker color and more vigorous plant.

Website/Catalog  (1925)  Page(s) 81.  
 
Weigand's Crimson Rambler. More floriferous than Crimson Rambler, bloom somewhat darker, blooms earlier.

Website/Catalog  (1925)  Page(s) 11.  
 
Non Plus Ultra, blooms somewhat darker than Crimson Rambler

Website/Catalog  (1914)  Page(s) 5.  
 
Weigands Crimson Rambler (multiflora), compact, pillar rose, somewhat dark purple, early-blooming

Magazine  (12 Aug 1911)  Page(s) 404.  
 
The Parentage of Roses.
The following list of the world's Roses and their parentage has been compiled by Mr. Robert Daniel, 38 Russell Road. Fishponds, Bristol, and by his kind permission we are enabled to publish it...
Weigand's Crimson Rambler... Multiflora Scandens*, Weigand, 1904, Crimson Rambler X Blanche Rebatel

*i.e., Climbing Polyantha