Book  (Apr 1993)  Page(s) 401.  
 
Mrs. Wm. G. Koning Polyantha, pure white, 1917, 'Louise Walter' sport; Kluis & Koning. Description.

Book  (1936)  Page(s) 389.  
 
Koning, Mrs. William G. (polyantha) Kluis & Koning 1917; sport of L. Walter; pure white, medium size, double, open, lasting, cluster-flowered, fragrance 4/10, floriferous, continuous bloom, growth 6/10, bushy. Sangerhausen

Website/Catalog  (1929)  Page(s) 45.  
 
Polyantha Roses
Polyanthas are, perhaps the most truly everblooming of all Roses, being scarcely ever out of flower during the whole growing season... They are especially valuable for massing, edging, and to some extent for mingling with other flowers.
Mrs. Wm. G. Koning. (Kluis & Koning, 1916.) Pure white, globular blooms of good size in rather large clusters, continually produced by dwarf healthy plants, with good foliage.
Doubtless the best white Polyantha and particularly excellent in cool weather. Splendid for edging or long borders.

Book  (1926)  Page(s) 56.  
 
Mrs. Wm. G. Koning (Kluis & Koning, 1916) is also a good white, especially in the autumn;