Istorii︠a︡ grazhdanskoĭ voĭny i intervent︠s︡ii v SSSR : sovremennai︠a︡ burzhuaznai︠a︡ istoriografii︠a︡ / V.P. Naumov, A.A. Kosakovskiĭ. (OCLC #26511741)

Subfield ǂa of 050 is repeatable, and I often see this feature used for titles in a series. For example:

050 04 ǂa D410 ǂb .N652 1976, no. 11 ǂa DK265.9.H5

The first call number should be used if you class the series together under one call number:

D410 .N652 1976, no. 11

(That’s D410 for 20th century periodicals, cuttered on the romanized name of the series: Novoe v zhizni, nauke, tekhnike. Serii︠a︡ “Istorii︠a︡”)

The second class number is provided for those who class the series separately, with a specific call number for each volume. In this case, that is:

DK265.9.H5

(History of Russia, Revolution, 1917-1921, Historiography). Subfield ǂb is not repeatable, so no item number is provided.

We class this series separately, so I used the second class number, adding a cutter for the author, Naumov:

090 ǂa DK265.9.H5 ǂb N37 1976