North

North, J.J. English Hammered Coinage Vol 1: Early Anglo-Saxon to Henry 111 c. A.D. 600-1272. (London, 1994)

North, J.J. English Hammered Coinage Vol 2: Edward 1 to Charles 11 1272-1662. (London, 1991)

Degrees of Rarity
ER = Extremely Rare
R = Rare
S = Scarce
N = Normal
C = Common