In 1982 he was the subject of a book written by the American organist John T. Fesperman.
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His company built the pipe organ in Messiah Lutheran Church in Germantown, Maryland, dedicated on 21 April 1991.
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To honor his achievements, in 1968 Flentrop was awarded an honorary doctorate in musicology by the American Oberlin College, Ohio for his "pioneering work in classic organ building".
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