@book{ 0-1136981519, title = {Paul Klee: Aquarelle und Zeichnungen; Museum Folkwang Essen, 22. August bis 12. Oktober 1969}, author = {Klee, Paul and Honisch, Dieter}, editor = {Klee, Paul}, editor = {Honisch, Dieter}, address = {Essen}, publisher = {}, year = {1969}, language = {German}, url = {https://katalog.ub.uni-leipzig.de/Record/0-1136981519} }