BOOKS in the catalog
Käthe Kollwitz / Elizabeth Prelinger ; with essays by Alessandra Comini and Hildegard Bachert
Catalog of an exhibition held May 3-Aug. 16, 1992 at the National Gallery of Art, Washington, D.C
Diary and letters of Kathe Kollwitz. Evanston: Northwestern University Press, 1988.
ARTbibliographies Modern is another good source for articles on this artist.
NOTE that many of these articles are not immediately available at Colby. Allow a couple of days for ILL to retrieve them from other libraries.
Search ARTstor for Käthe Kollwitz