In 1934, Jozef Obrebski commenced his collaboration with the Institute for the Study of Nationalities (IBSN) in Warsaw, which he successfully continued until World War II. Under the auspices of the IBSN and its associates, Obrebski developed a broad range of academic activities which included his fieldwork in the region of Polesie in Eastern Poland in 1934-1937. This project resulted in a series of articles by Obrebski in major Polish journals; two of these, 'The Ethnic Problem of Polesie' and 'The Present Inhabitants of Polesie', appeared in 'Sprawy Narodowościowe', a bi-monthly published by the Institute. Moreover, within the framework of this institution, Obrebski delivered a series of lectures on 'Static and Dynamic Approaches in Ethnic Studies', and, as its representative, participated in major meetings of sociologists in pre-war Poland. In 1936, he was nominated member of the Institute, alongside many eminent personalities. The period between 1934 and 1939 occupies a prominent place in Obrebski's career, by virtue of his achievements in ethnography and sociology, in particular. It brought him recognition based on his most significant study of Polesie, done in collaboration with the Warsaw Institute.
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