Book  (2021)  Page(s) 454.  Includes photo(s).
 
Translation:
'Moje Hammarberg' ....Introduced by Stockholm municipality in 1931. Sport or seedling of Rosa rugosa...Named after Mauritz, often called Moje, Hammarberg, Stockholm, who at the time was city gardener in Stockholm....
The DNA-Profile was prepared by Pom [Swedish Programme for Plant Diversity]. According to the method which Pom uses, the variety is genetically identical with Rosa rugosa, the hedgehog rose, which means that the similarity index between ‘Moje Hammarberg’ and the reference Rosa rugosa is 100%.

Book  (Dec 1998)  Page(s) 420.  Includes photo(s).
 
Moje Hammarberg Hybrid Rugosa. Hammarberg (Sweden) 1931...double flowers of reddish violet... The fruit is large, red and abundant -an uncommon occurrence in very double Hybrid Rugosa roses...

Book  (11 Jun 1993)  Page(s) 39.  Includes photo(s).

Book  (11 Jun 1993)  Page(s) 39.  
 
Parentage unknown. Hammarberg (Sweden) 1931. Description... Lovely, large, [crimson-purple,] asymmetrical, and loosely double blooms [with] yellow stamens... very hardy.