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Great Encyclopedia. T. 18. Statistics - Undozero
| Great Encyclopedia. T. 18: Statistics - Undozero. Books St. Petersburg: Knigoydzd. "Education", 1900-. cens. 1904. |
| Great Encyclopedia. T. 18: Statistics - Undozero. Books St. Petersburg: Knigoydzd. "Education", 1900-. cens. 1904. |