Morocco is mentioned in the discussion of Islamic political plurality: ‘there still remained the sultans of Morocco in the far West… who in their own dominions laid claim to similar titles [as the Ottoman caliph].’ Quedenfeldt’s study of Moroccan religious brotherhoods is cited in footnotes.
Source
The Achehnese, Vol. II, by Dr. C. Snouck Hurgronje, translated by A.W.S. O’Sullivan, indexed by R.J. Wilkinson. Leyden: E.J. Brill, 1906.