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Are you R. Fruin, author of the books below?
The Siege and Relief of Leyden in 1574 by R. Fruin De Huidige Stand Van Het Costervraagstuk by R. Fruin Het arbeidsvraagstuk in verband met de noodzakelijke ontwikke... by R. Fruin Het voorspel van den Tachtigjarigen oorlog. 1908 [Leather Bound] by R. Fruin THE SIEGE AND RELIEF OF LEYDEN IN 1574. Translated by Elizabe... by R. Fruin Manual for the Arrangement and Description of Archives by S. Muller


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