William Smith’s Dictionary of Greek and Roman Antiquities was published several times between 1842 and 1891, and resembles other dictionaries/encyclopaedias like the Realenzyclopädie by Pauly and Wissowa and the Dictionnaire des Antiquités Grecques et Romaines by Daremberg and Saglio. The books were published and republished at about the same time; an article on their mutual influence might be interesting.
LacusCurtius’ Bill Thayer recently informed me that his online publication of Smith’s dictionary is almost complete, missing only something like 25 articles. That was after he had added Cyma, Discus, and Vis, but before he added (on the first of April) Comoedia. Often, archaeological research has improved our understanding of ancient realia, but Smith’s articles are still useful because they collect all written sources.