This index was published in Wingate’s “Report on the Dervish Rule in the Eastern Sudan” (May 1891) as Appendix VI (a) entitled “Three Indexes to Miscellaneous Letters Found at Afafit”.
This report can be found in Durham (SAD 253/1) and in the NRO (CairInt 3/03/46).
The original index in Arabic can be found in NRO Mahdiyya 1/30/06 (see NRO-M001126)
c. 02-05/1891