Повести о Куликовской битве / изд. подготовили М.Н. Тихомиров, В.Ф. Ржига, Л.А. Дмитриев. (OCLC #2728286)

RDA 3.4.5.5 on Misleading numbering describes cases where the numbering on the last page does not represent the total number in that sequence, and says not to correct it unless it gives a completely false impression of the extent of the resource. For example, this volume’s last page has the page number misprinted, so the extent should be recorded as:

51, that is, 511 pages