Rafał Borychowski (MA), a doctoral student at the Siedlce University Doctoral School in the discipline of history, is a co-editor of the second volume of the Światy Archiwalne [Archival Worlds] series, entitled Archiwalia nieoczywiste [Unobvious Archive Records]. The multi-author monograph was published by the State Archive in Siedlce in cooperation with the Scientific Publishing House of the Siedlce University of Natural Sciences and Humanities.