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https://books.google.com/books/about/Arithmeticae_practicae_regulae_brevissim.html?hl=nl&id=blw5_jxCRgcC Arithmeticae practicae regulae brevissimae - Gerardus von Gutschoven - Google Boeken gerardus von google boeken https://books.google.nl/books?id=blw5_jxCRgcC&hl=nl&source=gbs_navlinks_s Arithmeticae practicae regulae brevissimae - Gerardus von Gutschoven - Google Boeken gerardus von google boeken https://china-bibliographie.univie.ac.at/2012/06/24/brevissimae-controversiae-anno-1710-recusae-censura/ Brevissimae controversiae anno 1710. recusae censura | Bibliotheca Sinica 2.0 anno censura bibliotheca sinica