Reproduced in Kulin-Zerinváry: A távcső világa. Budapest, 1958.
Courtesy of I. Almar
” In the 1920-1926 yrs. with the help of a 270-millimeter reflector NP Barabashov conducted a large number of visual observations of Mars in different spectral ranges, the result of which was the compilation of a map of the planet’s surface.” (Wikipedia, Russian version)