Gorod Surgut i ego torgovli︠a︡ v XVII v. : preprint / O.N. Vilkov. (OCLC #37968012)
In academic publishing, a preprint is a draft of a paper that has not yet been published in a journal. As changes may be made between the draft and any eventual publication, we consider the preprint to be different from the published version:
Gorod Surgut i ego torgovli︠a︡ v XVII v. / O.N. Vilkov. (OCLC #39906111)
and catalog it on a separate record.