Musical Instruments at the Library of Congress, Available Online, 1897 | Library of Congress
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Johannes Adler Recorder Flute C-Tenor 1822KDHB & Concerto | Reverb
Adler Heinrich Alto Recorder – Thomann United States
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Dayton C. Miller Collection, Available Online | Library of Congress
Johannes Adler Recorder Flute C-Tenor 1822KDHB & Concerto | Reverb
