Russian-English conversation book = Russko-angliĭskiĭ razgovornik / E.M. Coff and F.M. Rozhkova. (OCLC #46638889)
One reason to not limit your OCLC search by date is that the limit uses the fixed field copy of the date, which is easier to do math/comparison with than the variable field 260/264ǂc (which may include phrases like [not before 1800] and dates in other calendars) but in my experience is also coded incorrectly more often than the variable field.
An otherwise good record I found for this title had 1960 in the 260ǂc and the call number, but 1950 in the fixed field (now corrected).