Surprisingly, as I reviewed that list I found it has changed only slightly. Though we have much more space we reserve it to carry extra books we hope to read on passage then use for trading. We rarely hold on to any except those listed below.

For Navigation -
Ocean Passages for the World, British admiralty
249 tables, all three volumes including stars
Nautical Almanac, Commercial version, Paradise Cay Pub
American Practical Navigator, Nathanial Bowditch
Light list of intended cruising area (most up to date available)
Chart 1 (Guide to symbols on U.S. charts)
International rules of the road
British guide to Chart Symbols
Allen Watts Instant Weather forecasting

Reference-
Merck Manual of Medical Information - Home Edition by Merck and Co.
Your Offshore Doctor, by Michael H. Beilan
(We also carry the manual provided with three-day intensive emergency medical course we took under direction of three emergency room doctors - Not commercially available.)
Self-Steering for Sailing craft, John Letcher
Joy of Cooking, New edition, Rombauer and Becker
Webster's New Collegiate Dictionary
Roget's thesaurus
New York Times Yearly Information Almanac
Spanish English dictionary
French English dictionary
Bible
Cruising guides (these change with each area and we trade them along with charts)

Special Interest -
Venturesome voyages of Captain Voss- Captain J.C. Voss
Cruise of the Cachalot - Frank Bullen
Ship of Gold in the Deep Blue Sea, by Gary Kinder
Poems of Robby Burns
Self-publishing Manual, Dan Poynter