Your search for "rif" revealed the following:
Ait Waryaghil: al tarikh, al mu'assassat, al 'alaqa ma'a al sulta أيت ورياغل: التاريخ، ألمؤسسات، و العلاقة مع السلطة
$ 17.00The Ait Waryaghir of the Rif: its history, institutions and relations with the central government.
Tamhid al jibal تمهيد الجبال
$ 15.00Published for the first time from manuscript. The account of Mawlay al Hasan's expedition to the northern provinces in 1889.
Nata'ij Al-Ihsan fi Madih 'Ali Ibn 'Abd Allah Al-Rifi
$ 16.00Poetry dedicated to the qaid of Tangier 'Ali Ibn 'Abd Allah Al-Rifi