Welcome to the Seymour de Ricci Bibliotheca Britannica Manuscripta Digitized Archive, a searchable database containing the digitized notes of the historian and bibliographer Seymour Montefiore Robert Rosso de Ricci (1881-1942) made for the compilation of his unfinished Bibliotheca Britannica Manuscripta. This project was intended as a companion work to his Census of Medieval and Renaissance Manuscripts in the United States and Canada, published between 1935 and 1940. De Ricci's notes, compiled in thirty-four boxes containing over 60,000 index cards and originally bequeathed to the Institute for Historical Research in London, are currently housed in the Senate House Library at the University of London (more info). In collaboration with the Senate House Library, the Schoenberg Center for Electronic Text and Image has made this valuable resource available online in downloadable pdf files. The cards are arranged by individual Collectors (listed by last name) and Repositories (by town, institution, or college). You can Browse by collector or repository or Search them by keyword, country, or county. To complete the archive, we have also included De Ricci's notes on Dated Sales and his Miscellaneous Notes. These segments can be browsed through dedicated links found on the left side bar. We would like to extend our gratitude to Dr. Marc Leroy de Ricci for kindly granting permission to publish the archive online.