A pair of celestial nautical navigation items including an April 1906 Azimut or True Bearing of Celestial Objects for The Great Lakes From Latitude 41? to 49? Inclusive with Maps by Frank Henrich. The book has 63 pages with explanation and use of the tables, tables, auxiliary tables, and fold out maps in the front and back. The book shows writing marks in the front few pages, a loose protractor, staining and moderate discoloration on the cloth cover. Interior shows mild to moderate discoloration along the edge of the pages from handling and use. Also includes a large The Heavens map dated December 1957 from The National Geographic Magazine, Vol. CXII, No. 6, measuring approximately 42 1/2" x 28", showing minor edge wear from storage. See photos for best description.