The Dictionary of Heraldry: Feudal Coats of Arms and Pedigrees
Available on Amazon at: https://www.amazon.com/dp/1851709304?psc=1&ref=ppx_yo2_dt_b_product_details
Author: Joseph Foster
While I have several books on heraldry, this is the only one that covers a large number of historical coats of arms within English heraldry, with many depicted in full color. In this way, I can find appropriate coats of arms for the period. Also, if I get a hankering to make up my own characters, I can more easily avoid the faux pas of duplicating a real coat of arms.