Books by Harold S. BlackburneClick here for all books by Harold S. Blackburne available for purchase on-line. Position Finding by the Improved "Sumner" Method: Contrasted with the New Navigation (Marcq St. Hilaire System), and the Old "Sumner" Method; Together ... Special Star Reduction and Azimuth Tables by Harold S. Blackburne listed for sale on Bibliophile Bookbase. Click here for full details and on-line purchase. Bibliophile Bookbase lists over 5 million books, maps and prints including first editions, livres anciens, livres illustrées, rare books and out-of-print books. Bibliophile Bookbase for antiquarian books, maps and prints. |