9 boxes with about 40 folders (further cataloging in progress)
Berlin, Archives of the Max-Planck-Society; Marburg, Deutsches Dokumentationszentrum für Kunstgeschichte; Munich, Staatsarchiv and Bayerisches Hauptstaatsarchiv; Rome, Bibliotheca Hertziana, archive, records related to Lehmann-Brockhaus also in section “Hertziana Allgemein”; Rome, Bibliotheca Hertziana, Photographic Collection, Donations and bequests “Nachlass Otto Lehmann-Brockhaus”