The Bibliographical Society has sponsored work on recording, identifying and making available in free, searchable, electronic form watermarks in Spanish and English incunabula. This work has been incorporated in the Bernstein, Memory of Paper watermark database. Links between the Bernstein watermark database and the Incunabula Short-Title Catalogue are being built.
Watermarks in Incunabula Printed in Espana (WIES) has been under the direction of Gerard van Thienen, and Watermarks in Incunabula Printed in Great Britain has been compiled by Paul Needham and edited for the database by Gerard van Thienen.
Bernstein, Memory of Paper database of watermarks