An assessment of how important the sea was in the middle ages.
Mansa Musa and Timbuktu: The History of the West African Emperor and Medieval Africa's Most Fabled City, Paperback/Charles River Editors
Charles River Editors
Arab Seafaring: In the Indian Ocean in Ancient and Early Medieval Times - Expanded Edition, Paperback/George F. Hourani
George F. Hourani
The Sea in History – The Early Modern World
Christian Buchet
The Sea in History – The Ancient World
Philip De Souza
The Sea in History – The Modern World
N. A. M. Rodger
The Sea in History - set