A Catalogue of the Royal and Noble Authors: Of England, Scotland, and Ireland; With Lists of Their Works. E-book. Formato PDF Horatio Walpole   -  Forgotten Books, 2017  - 

The Harleian manuscripts, 7007 and 7008, contain three short letters from Robert, earl of Essex, to his lordship's juvenile associate, Henry Frederick, heir apparent. These have been printed by Brr Birch in his Life of that promising prince, and are of little interest.