The paper deals with research interests of Eugen Jona focused on description of dialects of Novohrad. These dialects - their system, development and functioning - are varieties that Eugen Jona knew from his own experience. Their summarizing description has been preserved in a manuscript of Jona's unfinished monograph Novohradske narecia (Dialects of Novohrad) that was intended to be a part of a complex encyclopaedic work Novohrad. The manuscript of the dialect monograph by E. Jona was published on the occasion of centenary of his birth and from the cognitive point of view besides the description of the system it brings considerable sociolinguistic findings of the author - a shift of many regionally differentiated or territorially defined items towards common Middle Slovak features.
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