Siblet (Siberian Society of Friends of the Air Fleet)
Siblet (Siberian Society of Friends of the Air Fleet) was formed in April 1923 and operated until 1925 when it was merged into Dobrokhim (Union of Societies of Friends of Aviation and Chemical Defense and Chemical Industry of the USSR).
Pesterev, V. I. (1997) Khronika aviatsii Iakytii 1921-1987: v trekh chastiakh Novosibirsk, Ecor. (P. 15, Siblet 1923 formation)
Ngs.ru: (Siblet general history)
Mercer and Middlesex Auctions LLC publication, 2014 (Siblet general history)