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Ján Kollár´s letters was a text analysis project which the editor Jozef Ambruš (1914 – 1993) had begun to prepare as early as the beginning of the 1970s. The first volume was published as a book in the year 1991. After Ambruš´s death the responsibility to finish it was taken over by Augustín Maťovčík from Slovak National Library in Martin, who himself extended and partly checked the materials left...
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