Correspondence between Felix Bohnert, Theodor Bömelburg, Moritz Julius Bonn, Arthur Bonus, Wilhelm Borée, Richard van der Borght, Conrad Bornhak, J. C. B. Mohr (Paul Siebeck) <Tübingen>, Böhmische Escompte-Bank and Credit-Anstalt <Praha>, Böhmische Union-Bank <Prag>, De Erven F. Bohn. Boekdrukkers en Uitgevers, Bohnenberger and Cie <Niefern>, C. F. Boehringer
Correspondence between Georg Bohrmann, Johannes Bollmann, Robert Piloty, Emil Bamberg, Georg Bondi, Moritz Julius Bonn, Gottlieb Nathanael Bonwetsch, J. C. B. Mohr (Paul Siebeck) <Tübingen>, Boll and Pickardt, Verlagsbuchhandlung <Berlin>, Georg Bondi <Berlin> and Bonifacius-Druckerei <Paderborn>
Family documents of the barons and counts of Linden with the estates of Joseph Baron of Linden (1804-1895) and Hugo Baron of Linden (1854-1936) (holdings)
Friedrichsen, L., co-owner of the bookshop (see below), Managing Director of the "Geogr. Gesellschaft" and 2nd Managing Director of the Hamburg Department of the German Colonial Society
Letters of the Privy Legation Council and Director of the Colonial Department of the Federal Foreign Office Paul Kayser to his uncle, Julius Baron, Professor of Laws in Bonn
Letters of the Privy Legation Council and Director of the Colonial Department of the Federal Foreign Office Paul Kayser to his uncle, Julius Baron, Professor of Laws in Bonn: Vol. 1
Letters of the Privy Legation Council and Director of the Colonial Department of the Federal Foreign Office Paul Kayser to his uncle, Julius Baron, Professor of Laws in Bonn: Vol. 2
Letters of the Privy Legation Council and Director of the Colonial Department of the Federal Foreign Office Paul Kayser to his uncle, Julius Baron, Professor of Laws in Bonn: Vol. 3
Letters of the Privy Legation Council and Director of the Colonial Department of the Federal Foreign Office Paul Kayser to his uncle, Julius Baron, Professor of Laws in Bonn: Vol. 4
Letters of the Privy Legation Council and Director of the Colonial Department of the Federal Foreign Office Paul Kayser to his uncle, Julius Baron, Professor of Laws in Bonn: Vol. 5
Letters of the Privy Legation Council and Director of the Colonial Department of the Federal Foreign Office Paul Kayser to his uncle, Julius Baron, Professor of Laws in Bonn: Vol. 6