While librarians and bibliographers accept by default the understanding of Sibirica as “literature about Siberia”, book collectors developing a Siberian theme do not adhere to this approach and proceed from less strict ideas about the scope and content of the concept. Besides the thematic criterion for the selection of literature, they take into account a number of formal ones (Siberia as the place of publication, the place of birth / temporary stay of the author, “Siberian” inscriptions) and also track the indirect connection of sources with the region and their typological significance for Siberian studies. The resulting amateur collections implement a kind of field model, where along with the core (Sibirica in the conventional sense) there is a precore, of near and far periphery (Sibirica in the unconventional sense). The private library of Tomsk local historian and bibliophile Vladimir Domaevsky, formed in the last third of the XX – early XXI century, is a vivid example of a collection with the described structure. The analysis of the publications from this book collection stored in the fund of the Tomsk Regional Universal Scientific Library named by A. S. Pushkin, with the involvement of the “Sibirica Domaevsciana” catalog data, allowed us to reveal the complexity of the amateur interpretation of the termoid “Sibirica” and to substantiate a broader view of the tasks of regional bibliography.