https://uninsubria.unifind.cineca.it/resource/item/288782?language=en-US
UNIFIND - UNINSUBRIA - Svedesi in Italia: il viaggio di Jacob Jonas Björnståhl (1770-1773)
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in italiail viaggiojacob jonassvedesi
https://www.ignant.com/tag/jacob-jonas-the-company/
Jacob Jonas The Company Archives - IGNANT
jacob jonasthe companyarchivesignant