Johannes von Gumpach
Practical Tables For The Reduction Of Mahometan Dates To The Christian Calendar (1856)
Johannes von Gumpach
The treaty-rights of the foreign merchant, and the transit-system, in China supported throughout by official documents, partly unpublished
Johannes von GumpachThe Burlingame Mission: A Political Disclosure, Supported by Official Documents, Mostly Unpublished. to Which Are Added: Various Papers and Di
Johannes von Gumpach