in 1939, he became privatdozent for his seminal work and habilitation thesis "naujausių proistorinių tyrinėjimų duomenys" (findings of the most recent archaeological explorations). this work became a textbook on prehistory of lithuania. it was superseded only by "lietuvos archeologijos bruožai" published in 1961. puzinas aggregated, summarized, and interpreted data from different excavations in 1928–38 and created a chronological outline of the prehistory of lithuania. his periodization of the three ages in lithuania is still used by modern scholars. the work featured a large number of new scientific terms in lithuanian language that puzinas created in collaboration with linguist . to that end puzinas created a card index file with archaeological terms in various languages (lithuanian, polish, german, russian). the file, about 9,000 or 10,000 cards in total, is preserved by martynas mažvydas national library of lithuania. possibly, it was an embryo of a multilingual archaeological dictionary. among the basic terms introduced by puzinas are "radinys" (find) and "žalvario amžius" (bronze age).