866-868 $a Example:

855 ##$81$a(year)$oalphabetical index

865 42$81.1$a1937-1942

865 42$81.2$a1846-1968

865 42$81.3$a1969-1978$oTen year cumulative index

868 40$80$a1937-1968, plus 1969-1978 cumulative vol.

[The 868 fild provides an alternative display and replaces the 865 fields.]