Over thirty years ago, the International Women's Club in Kaduna put together a cookbook called Recipes from the Crocodiles, “Kaduna” being the Hausa word for “Crocodiles.” Probably all expats in Northern Nigeria, at least those who cook, have seen or heard of this book, but most of our copies are falling apart. I've recently scanned the book and put it into a PDF file which you can download.
It's a great book with hundreds of recipes in all categories, all of which have been tweaked for use in Nigeria. The contents also include substitute ingredients for those not available here, British-to-American equivalents, Hausa words for foods, useful tips for cooking and the home, and so on.
There is a similar book “Wild Boar on the Kitchen Floor” which you can download here at Sparkling Adventures. This one was put together over several years by Peace Corps volunteers in Niger.