Jay Davidson, who worked with the Peace Corps in Nouakchott from 2003-2005, revised/produced this very insightful introduction to Mauritanian culture and cultural adaptation guide. His website is no longer active, but I made a pdf from his original you can download here.
There's also a newer Peace Corps 'Language Component' available on ResearchGate here. Here's an alternative link if you find it difficult to download using their site (as I did).
