Title: Nabli͡udenīi͡a komet, 1911c , 1911f  i 1911 g : proizvedennyi͡a refraktorom  Varshavskoĭ Observatorii S.D. Chernago = Observations of comets 1911c , 1911f  and 1911g
Subjects: Comets, Observations
Time periods: 1911