The New England Historic Genealogical Society
The New York Public Library
The Society of Antiquaries of London
South West Heritage Trust
The Bodleian Libraries at the University of Oxford is the largest university library system in the United Kingdom.
The British Library is the national library of the United Kingdom and one of the world's greatest research libraries.
The Folger Shakespeare Library has the world's largest collection of materials relating to Shakespeare and his works, from the 16th century to the present day, as well as a world-renowned collection of books, manuscripts, and prints from Renaissance Europe.
The Shakespeare Birthplace Trust is the world’s leading charity in promoting the works, life and times of William Shakespeare.
The National Archives is one of the world’s most valuable resources for academic research and an independent research organization in its own right.