Note 12 — IETS OVER DE GRAMMATICALE BEOEFENING DER FRIESCHE TAAL IN HAREN GEHEELEN OMVANG.
Reading edition
»Quaedam ad Grammaticam spectantia, linguam Phrysicam, et prima elementa, ante centum quinquaginta et quod excurrit annos conscripta," fol. 3-13: En daarachter: »Fragmentum de literis Frisicis," fol. 14-21.