Dear Sir/ Madam,
Indeed a fascinating subject, the old Silk Road.....
I am a geologist with a large experience in map making, using various primary sources, from modern satellites products to old maps: superposing, create a new one from various elements, adding 3D elements like shades, shapes of the mountains, hills, etc.
I prepared for you a multidata files, some primary sources of the "Orient" (generic name, a part of the globe from Italy to China).
Various colors, combinations, included a B&W map. All depends on your publisher option (color or B&W) and or your options like: an antique locking map, or a half-modern one, with the new countries, etc.
But about such details we need ti discuss and you must see the preliminary file.
Can you give an email address to send you the file ?
Kind Regards,
Iulian Seba