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"Oregon" (Russian: "Орегон"), in the Brockhaus and Efron Encyclopedic Dictionary (Russian: "Энциклопедический словарь"), Volume XXII (1897)
"Oregon" (Russian: "Орегон"), in the Small Brockhaus and Efron Encyclopedic Dictionary (Russian: "Малый энциклопедический словарь Брокгауза и Ефрона") (1899-1902)
"Oregon" (Russian: "Орегон"), in the Jewish Encyclopedia of Brockhaus and Efron (Russian: "Еврейская энциклопедия") (1906-1913)