"Bibliographie Numismatique: Ordres et Decorations
“Bibliographie Numismatique: Supplement – Ordres et Decorations”, by Ivo Suetens, Brussels, 1969. Softbound, 1947pp. French text.
An early bibliography of printed books and publications or orders, decorations and medals of the world. A classic source to tell you what is out there in printed form on your area of interest.