Associations
International Advisory Committee of Keepers of Public Collections of Graphic Art (50 Lux Club)
Print Council of America. An association of United States curators, conservators and scholars of drawings and prints. This site has a very useful Search Index to Catalogues Raisonné.
Historians of Netherlandish Art
International Association of Paper Historians (IPH)
International Council of Museums (ICOM)
The International Fine Print Dealers Association (IFPDA)