The research was conducted by the late Gerard van Thienen (former KB The Hague curator). The project was funded by the Bibliographical Society (London, BS). The data were inserted in the database by Marieke Polhout, Jill Hungenaert, Paula Stravers and Janneke Verdijk under supervision of Gerard van Thienen, with advisory support of Marieke van Delft (TheHague, KB). The web presentation was implemented by Emanuel Wenger (Vienna, ÖAW).
The legacy of Gerard van Thienen concerning the watermarks of incunables printed in Spain is hold by the Archivo Municipal de Oviedo (ANA Mª HERRERO MONTERO).