Koroloff has authored scientific publications on the Kostur dialect. His book about the village of Drenoveni in the Kastoria region, where both his paternal and maternal ancestors lived, has received praise from the scientific community as a source of “unique ethnographic, linguistic, and historical information”, which “greatly enhances our understanding of the history, ethnology, and the language of the southwesternmost parts of Macedonia” and “will be the basis for any further research in that field“. The book presents the history, language, traditions, and folklore of the village and the surrounding region in the Aegean Macedonia. It also covers the activity of the Bulgarian Exarchate и IMARO, historic events like the Ilinden–Preobrazhenie Uprising, as well as the Greek administration in the 1912–1950 years. The research is based on interviews with numerous people from the village, who had emigrated to North America, and on voluminous historiographical and dialectological literature. Larry Koroloff has also provided contributions to the book “Bulgarian dialect texts from Aegean Macedonia“ of the notable Bulgarian dialectologist and phonologist Blagoy Shklifov, and sponsored its publication by the Bulgarian Academy of Sciences in 2003.