SDCL § 7-9-11: Numbering and alphabetical index of instruments relating to personal property.

The register of deeds with whom any chattel mortgage, bill of sale, conditional sales contract, lien upon personal property, or other instrument affecting personal property, or authenticated copy of any thereof, is filed, must endorse a number upon the same in consecutive order, together with the time of receiving the same and must enter the name of every party thereto in a book kept for that purpose, alphabetically, placing mortgagors and mortgagees, vendors and vendees, obligors and obligees, under a separate head and stating in separate columns opposite each name, the number endorsed upon the instrument, its date, the date of filing, the nature of the instrument, and in case of a lien, the amount secured or claimed thereby.