A Lexicon of Types

Can any of your readers inform me of the existence of a collection of emblems or types? I do not mean allegorical pictures, but isolated symbols, alphabetically arranged or otherwise. Types are constantly to be met with upon monuments, coins, and ancient title-pages, but so mixed with other matters as to render the finding a desired symbol, unless very familiar, a work of great difficulty. Could there be a systematic arrangement of all those known, with their definitions, it would be a very valuable work of reference,—a work in which one might pounce upon all the sacred symbols, classic types,…