Journey to Balkaria. The Notes from the Expeditionary Observations. The Year 1924 by M. Haidai

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Ukrainian Folk Melodies in the Unpublished Recordings of M. Lysenko by M. Haidai

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Mykola Oleksiiovych Hrinchenko (1888-1942) by M. Haidai

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The role of the regional periodical press in the illustration activity of the Kharitonenko's family (on materials of 1990–2000 ages.) by O. M. Haidai

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Business and public work Kharitonenko's dynasty in documents of the State archives of Sumy region by O. M. Haidai

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The evolution of the cultural status of entrepreneurs in the second half of XIX – early XX century (for example of a collector P. I. Kharitonenko) by O. M. Haidai

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Commissioner for safe environment: objective and subjective grounds for implementation of institution by A. M. Haidai

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Sugar industry as a part of agricultural crops: history of formation and development by example of Kharytonenko's enterprises (mid XIX – early XX c.) by O. M. Haidai

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Influence of I. G. Kharytonenko on the sugar industry development of the Russian Empire by O. M. Haidai

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Synthesis, physico-chemical properties of Gd(III) and Dy(III) complexes with ethylenediaminedisuccinic acid by O. K. Trunova, H. V. Shovkova, Ya. M. Haidai, N. V. Rusakova, T. O. Makotryk, I. M. Hryhorasheva

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Synthesis and study of Nd(III) and Zn(II) heterometallic complexes with ethylenediaminedisuccinate acid by O. K. Trunova, N. V. Rusakova, H. V. Shovkova, Ya. M. Haidai, Yu. Korovin, O. V. Malinka

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