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Books about Flentrop:
Flentrop in America: An account of the work and influence of the Dutch organ builder D.A. Flentrop in the United... by John T Fesperman (1982)
Flentrop Orgelbouw, 75 years by Jan Jongepier (1978)
Antieke nederlandse huisorgels uit het bezit van Dirk Andries Flentrop =: The Flentrop collection of antique Dutch... by Arend Jan Gierveld (1981)
Wiki information Flentrop:
Flentrop is a Dutch company based in Zaandam that builds and restores organs.
Dirk Andries Flentrop was a Dutch organ builder. He built or restored many major organs in the United States and in Europe. He was noted for his 1977 restoration of two organs from the 17th and 18th centuries in the Mexico City Metropolitan...