Books by P. de Clercq:
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Clercq, P. de: Lytse Fryske Spraekleare: It Westerlauwersk om 1900 Hinne Oangeande (in Frisian; Leeuwarden: R. van der Velde, 1904), also by G. Postma (page images at HathiTrust; US access only)
Additional books by P. de Clercq in the extended shelves:
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Clercq, P. de: Aufruf an die Nordfriesen in Schleswig, zur Förderung ihrer alten Heimathsprache. Oprop oan de noardfriezen yn Sleeswyk, ta it foartsterkjen fen hjar âlde geasprake ... ([Veenwouden (Friesland)], 1907) (page images at HathiTrust; US access only)- Clercq, P. de: Oer de bifoerdering fen- en it ûnderwiis yn de fryske tael. (N. Miedema & Co., 1900) (page images at HathiTrust; US access only)
Find more by P. de Clercq at your library, or elsewhere.