1. Caer Drewyn and its environs (2010-2011 season)

   Karl, R. (PY)

   1/11/10 → 1/08/12

   Project: Ymchwil

2. Hillforts of North Wales 2011-12: Caer Drewyn and its Environs

   Karl, R. (PY)

   1/04/12 → 31/01/13

   Project: Ymchwil

3. Hillforts of North Wales: Caer Drewyn and its Environs 2009

   Karl, R. (PY)

   1/10/09 → 31/08/10

   Project: Ymchwil

4. Hillforts of North Wales: Moel y Gaer Llanbedr

   Karl, R. (PY)

   1/07/09 → 31/08/10

   Project: Ymchwil