Le Dialecte de Syaouh (Siwi Berber)

Publisher: Departemen Pendidikan Nasional
Publication date: 1890
Number of pages: 114128 of 351 brought back A study of the language of the Siwa oasis in western Egypt. Siwi is a Berber "outpost" and correspondingly the language is a form of Berber, not an Arabic dialect.
This book only has a very brief overview of Siwi morphology. It mostly consists of a French-Siwi dictionary. It would be even nicer to have Walker's book from 1921, but it seems a bit more difficult to find.