The IHR library holdings form part of the catalogue of the University of London Research Library Services (ULRLS), which covers the libraries of the Institutes of the School of Advanced Study and the Senate House Library. It is available on the Internet at http://catalogue.ulrls.lon.ac.uk, with a customised page for the IHR available at http://catalogue.ulrls.lon.ac.uk/search~S10.

When searching across all collections, the records of the following libraries will be displayed. The abbreviation (where applicable) indicates how each library's holdings are marked in the catalogue:

• Institute of Advanced Legal Studies (IALS)
• Institute of Classical Studies (ICLASS)
• Institute of Commonwealth Studies (ICOMM)
• Institute of Germanic and Romance Studies (IGS)
• Institute of Historical Research (IHR)
• Institute for the Study of the Americas (ISA)
• Warburg Institute (WARB)
• Senate House Library
• Heythrop College
• Wallace Collection
• Bibliographical Society

A search can be limited to individual library's holdings.