[On the institutionalization of Russian pulmonology: the second and third stages of its history].

For the first time, the authors conducted a historical analysis of primary sources and identified 3 stages in the history of Russian pulmonology, naming 8 of its founders. The content is disclosed in two articles (the first one was published in No. 3 of our journal for 2024). This article tells about the second (pulmonology as an independent scientific and educational discipline within the clinic of internal diseases) and the third (as a new medical specialty) stages of the history of Russian pulmonology in the XX century.