A catalogue of several libraries and parcels of books lately purchased; comprehending a large collection of valuable books, In every part of Literature, and in all Languages, Arts and Sciences. Which will begin to be sold, May 1, 1787, the lowest Price printed in the Catalogue, By Leigh and Sotheby, booksellers, At their House, in York-Street, Covent-Garden. Catalogues to be had of the following Booksellers; Mr. Beckett, Pall Mall; Mr. Robson, Bond Street; Mr. Walter, Charing Cross; Mr. Owen's, Temple Bar; Mr. Sewel's, in Cornhill; and at the Place of Sale. - Where is given the full Value for Libraries and Parcels of Books