This first issue contains a thematic selection of the materials dealing with the claim of Croatia on Slavonia and with the establishment of its eastern frontier. The material embodies two complete unities. The first one contains the works elaborated by the Croatian parliament and Croatian royal conferences from 1792 to 1848 protecting the historical claim of Croatia on so called lower Slavonian districts from the Hungarian pretensions. The second unity contains documentation having origin from 1945 to 1947 on the occasion of the establishment of the frontier of the Republic of Croatia
