§ 920. Alphabetical indices in offices of county clerks. The clerk of
each of the counties within the city of New York, so long as he deems it
expedient, may continue the alphabetical indices of the parties to
notices of lis pendens, statutory notice of liens and claims upon land,
or of the parties to either of them, and of the owners of land against
which liens have been filed and of judgment debtors whose names appear
on record. The particular form of such alphabetical indices shall be as
such county clerk shall determine, and shall be certified by him as
having been prepared under the authority of this article. Such indices
shall be kept in the office of the county clerk or in such other place
as shall be provided for them and shall be public records.