laisser passer
 

I am planning a trip which will take in Morocco, Algeria, Mali, Mauritania, Senegal, Burkina, Niger, Nigeria and Cameroon. Is a laisser passer ok for all these countries? Where can i find a list of travel regs in each country (forgive if on lonely planet but its down at the mo!)?

Ok I've discovered about most countries. But Is Nigeria impossible with out Carnet? And what about Central African Rep?