Клавиатура Янко (Russian Wikipedia)

Analysis of information sources in references of the Wikipedia article "Клавиатура Янко" in Russian language version.

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1books.google.com

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1debenham.org.uk

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low place

archive.org

Loesser, Arthur. Men, Women, and Pianos: A Social History. — New York : Simon and Schuster, 1954. — P. 567–568. — ISBN 9780486265438.

books.google.com

Dolge, Alfred. Pianos and Their Makers. — (fulltext on Google Books link). — Covina/Dover, 1911. — Vol. 1. — P. 78–83. — ISBN 0-486-22856-8.

debenham.org.uk

English Patent 3404