books.google.com - The structure and volcanic activity of the northern Tanzania sector of the Gregory Rift Valley have hitherto been less well described than those in Ethiopia and Kenya. This book focuses on northern Tanzania where, although the volcanic area is smaller than those to the north, there are major features...https://books.google.com/books/about/The_Gregory_Rift_Valley_and_Neogene_rece.html?id=Om2oMjXK3R4C&utm_source=gb-gplus-shareThe Gregory Rift Valley and Neogene-recent Volcanoes of Northern Tanzania