23 books • 9 series
Book #1: Anglo Saxons
Book #3: The Vikings
Book #1: National Trail Guide 1: Offa's Dyke South
Book #2: National Trail Guide 2: Offa's Dyke North
Book #3: National Trail Guide 3: Cleveland Way
Book #4: National Trail Guide 4: the Ridgeway
Book #5: Pennine Way South