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
El ingenioso hidalgo don Quixote de la Mancha : (1608) / por Miguel de Cervantes Saavedra ; [con prólogo de Fredo Arias de la Canal]. (OCLC #793608594)
RDA 3.4.5.5 on Misleading Numbering says: when the numbering on the last page gives a completely false impression of the extent of the resource, record the numbering as it appears on the last page followed by that is and the correct number. The pages in this resource have content are both sides, but only the leaves are numbered, so its physical description is:
300 __ ǂa xviii, 277, that is, 554 pages ; ǂc 22 cm