- Chemnitzer Concertina - - Photos and links collected by concertina maker Christy Hengel of Minnesota and his friend Loren Schaeffler.
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- Concertina Library - - Documents for the study of English, Anglo, and Duet concertinas: history, instruction books, sheet music, patents, technical papers, rare periodicals, and new research by many leading scholars. Full texts to read, download, and print.
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- Concertina.net - - A complete resource for the anglo concertina enthusiast .
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- The MacCann Duet Concertina - - Authoritative source for the instrument patented in 1884 by John Hill MacCann. Offers complete scanned instructional booklet published by the inventor in 1902.
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- Wheatstone Concertina Ledgers - - Colour scans of C. Wheatstone and Co. production and sales ledgers, from the concertina document archives of the Horniman Museum in London.
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