Thanks for the extra info. Yes, the maps will need to be paper as they will be needed on my trip to Mauretania. A CD ROM may be suitable but I have had never had maps on cd so I don't know how easy they will be to print on my pc.
Following the link for Landkarten I saw a map of Mauretania divided up into boxes for each 1:200,000 map - all four that I am looking for are shown. However, when I go to the online shop and search for Landkarten Mauritania I am only getting the 1:2 million available for sale. I am not able to find the 1:200,000 maps themselves in the shop. Am I missing something obvious?