Richard Heber's books can often be recognised by his acquisition note in characteristic small handwriting; or by the neat excision where it has been cut from the top right-hand corner of the first flyleaf:
A rectangular ink stamp 'BIBLIOTHECA HEBERIANA', was added, according to Marc Vaulbert de Chantilly (lecture, 26/11/2000), probably by Thomas Frognell Dibden, in only the more valuable books:
[From the Penn Provenance Project]