Geography of Yemen and its Tribes
There is an online geographical text on the Arabian Peninsula, published by the King Abdulaziz Foundation for Research and Archives (Darah). This includes a section on Yemen (Volume 10, pp. 464-558) with details on tribes and placenames (although the English reckonings are not transliterated properly). Nor is it clear in the narrative text what original sources are being used, nor what dates apply to the shaykhs mentioned. Comments from anyone using this resource would be appreciated.
Below is a sample of the information: