"Antiquarian Books". Archived from the original on February 16, 2007. Retrieved 2007-02-16. Maak, R.K. Atlas to «Travel on the Amur river made by order of the Siberian department of the Emperor’s Russian Geographical Society in 1855». Saint-Petersburg, S.F. Soloviev, 1859.
"Antiquarian Books". Archived from the original on February 16, 2007. Retrieved 2007-02-16. Maak, R.K. Atlas to «Travel on the Amur river made by order of the Siberian department of the Emperor’s Russian Geographical Society in 1855». Saint-Petersburg, S.F. Soloviev, 1859.