Max Matthias (Matthias, Max)

German

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  via
  Steinway Service Manual. Edition Bochinsky: Band 49
  by Max Matthias
  Softcover, ISBN 3923639155 (3-923639-15-5)

English

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  Steinway Service Manual: Guide to the Care and Maintenance of a Steinway = Leitfaden Zur Pflege Und Reparatur Eines Steinway
  by Max Matthias
  Hardcover, E. Bochinsky, ISBN 3923639848 (3-923639-84-8)