Realizing the limitations of further research into the Danish language owing to the absence of adequate texts and dictionaries, in 1911, thanks to the support of Kristian Erslev and Carl S. Petersen, she founded the
Society for Danish Language and Literature (
Det danske sprog- og litteraturselskab or DSL) which she headed until 1931, whereafter she served as administrator. DSL gained importance through the publication of Jacobsen's numerous works. In collaboration with Harald Juul-Jensen (1882–1949), Jacobsen organized the work of publishing a comprehensive Danish dictionary,
Ordbog over det danske Sprog which appeared in 28 volumes from 1919 to 1956. As a result of her interest in
runes, thanks to the support of the
Carlsberg Foundation and in collaboration with
Erik Moltke,
Danmarks Runeindskrifter (Denmark's Runic Inscriptions) was published in 1942, a 3 volume work with descriptions, photographs of all surviving runestones, illustrations of destroyed runestones when available, maps and an index.
Danmarks Runeindskrifter provides the same level of completeness for runestones throughout Viking Age Denmark, geographically covering modern Denmark,
Southern Schleswig,
Scania,
Halland and
Blekinge. In addition, a pocket size version with the same title was published only containing short descriptions of the runestones. After the
Second World War, Jacobsen continued to organize and initiate the creation of other important works, including
Nordisk Kultur (Nordic Culture) and
Kulturhistorisk Leksikon for nordisk Middelalder (Encyclopedia of Medieval Scandinavia), completed in 1979. In 1952, she launched work on the popular
Nudansk Ordbog (Dictionary of Modern Danish) and, in 1957, on
Synonymordbogen (Synonym Dictionary). Lis Jacobsen died in
Hellerup on 18 June 1961 and is buried in Sindbjerg near
Vejle. Her husband died from tuberculosis in 1918, leaving her two teenager daughters, one born deaf. ==References==