Imperialism; the story and significance of a political word, 1840-1960, by Richard Koebner and Helmut Dan SchmidtRichard Koebner · First published 1964Open the Tome
Studies in medieval and modern thought and literatureRichard Koebner · First published 1955Open the Tome
Die eheauffassung des ausgehenden deutschen mittelaltersRichard Koebner · First published 1911Open the Tome
