Natur & Kultur is a Swedish publishing foundation with head office in Stockholm known for an extensive series of teaching materials. Its logotype is an apple tree. Overview. The publishing house was founded in 1922 by Johan Hansson and his wife Jenny Bergqvist Hansson, with a focus on educational and didactic works of literature. During the Second World War, it published anti-Nazi literature. It was transformed into a foundation in 1947.
https://en.wikipedia.org/wiki/Natur_%26_Kultur