Sanabria's Air Post Catalogue, 1943 Edition, by Nicolas Sanabria.  Sanabria is the most complete priced catalog of Air Mail issues of the world, including much specialized information on scarce and unusual air post issues and flights, plus air semi-postals not listed by Scott or others.  An indispensable resource in any philatelic library. 1943, Complete & Unabridged Edition, 930 pages, fully illustrated in B&W, hardcover, tight binding, light pencil checks on some pages, in very good overall condition, gently used.