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References
1.
Fox-Davies AC
. A Complete Guide to Heraldry . Bonanza , 1978 .
2.
Gass I.
A Glance at Heraldry . G . Harrup & Co , 1959 .
3.
Pine LC
. The Story of Heraldry . Country Life Ltd , 1952 .
4.
Boulton T.
Correspondence . Anaesthesia 1974 ; 29 :627 –632 .