Need to ask about a lot?

MONGOLIA - 1930's-1980's EX DEALERS STOCK BOOK A mint & used range (mostly used) presented on old manilla stock pages, in a non philatelic three ring binder. An extensive range with sets, top values, Airs & 'Back of the Book' issues etc with each issue identified by Scott Catalogue number with some shade & postmark interest, unchecked in any detail, light duplication seen throughout. Much of interest here! (guess 700+ stamps)