A large collection of twelve books published by the U.S. Defense Mapping Agency and the U.S. Navy Hydrographic Office for the purposes of marine navigation. Lot includes: "Sight Reduction Tables for Marine Navigation" Volumes 1-4, "American Practical Navigator" Volumes 1-2, "American Practical Navigator - 2002 Bicentennial Edition", "Tables of Computed Altitude and Azimuth" Volumes 3-5, and the "Handbook of the Napier Tercentenary Celebration or Modern Instruments and Methods of Calculation". *note - wear and discoloration with age, some damage noted, two copies of volume 4 of "Tables of Computed Altitude and Azimuth", published in a variety of dates