https://www.esbirky.cz/hledat/technika/3510943
eSbirky.cz - title.search.technique.list
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https://www.esbirky.cz/predmet/30751935?searchParams=%7B%22filter%22%3A%7B%22keywords%22%3A%5B%22joseph%22%2C%22hayden%22%5D%7D%2C%22order%22%3A%22relevance%22%2C%22itemsPerPage%22%3A24%2C%22path%22%3A%22eJwljMEKwjAQRH%2Bl7MGLQupRofgXXoyH0B1ZTdxIoi2h%2BO%2Bm8TTMG95cFlL3BB3pbD99f%2BMcwL50qYwSVoKDxE4qbGWvLZh2FO7qq2bNOrq3NU2BNVP5f5w8yhwT5%2BERM16yFVcYuqkIaUgImJyOoO%5C%2F1BxZRL8s%3D%22%7D&sequencePointer=9
eSbirky.cz - Josef Sonnenfels
Joseph von Sonnenfels (1733 - 1817).
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https://en.esbirky.cz/search/origin/17172
eSbirky.cz - results of search by material
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https://en.esbirky.cz/search/institution/4179394?material=17384&technique=7424568
eSbirky.cz - results of search by institution
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