The following institutes have research projects or a documentation center/library about aspects of the horse in art and history, and sometimes an upcoming symposium.
France:
Association pour l’Académie d’Art Equestre de Versailles, Centre de Recherche du Château de Versailles
Centre de Documentation de l’Ecole Nationale d’Equitation, Saumur-Terrefort
Germany:
Bibliothek-Hippologisches Institut des Deutschen Pferdemuseums, Verden
Great Britain:
British Sporting Art Trust, Newmarket
United States of America:
National Sporting Library and Museum, Middleburg VA