A Dictionary of the Booksellers and Printers who Were at Work in England, Scotland and Ireland from 1641 to 1667/Walker (Mathias)
WALKER (MATHIAS), bookseller in London; (1) 3 Hearts, West End of Pauls, 1664; (2) Under St. Dunstan's Church in Fleet Street, 1667. Chiefly remembered as one of the publishers of the first edition of Milton's Paradise Lost, in 1667. His earlier address is found in A. Gordon's Tyrocynium Linguæ Latinæ 1664. [Arber's Term Catalogue vol. i., index.]