Die Briefumschläge der deutschen Staaten, unter Benutzung amtlicher Quellen
By: bearbeitet von C. Lindenberg
Publisher: P. Feuser
Published: 1987
Place of publication: Stuttgart
Language: ger
Subjects: Covers (Philately); States; History; Postal service
Notes: Reprint. Originally published: Berlin : H. Brendicke, 1892-1943.

Heft 16, by F. Kalckhoff, published by R. Noske, Borna, Bezirk Leipzig.

Heft 17/18, by F. Kalckhoff, published by F. Seifert, Leipzig.