Bibliothèque Royale de Belgique (KBR) [City of Brussels, Belgium]

Flemish Institute for Archives [Ghent, Belgium]

Instituut voor Nederlandse Lexicologie (INL) [Leiden, Netherlands (the)]

KU Leuven (KUL) [Leuven, Belgium]

State Archives of Belgium (AE) [City of Brussels, Belgium]

University of Antwerp (UAntwerpen) [Antwerp, Belgium]

Vrije Universiteit Brussel (VUB) [City of Brussels, Belgium]