several thousand covers housed in 62 binders, arranged alphabetically by county (plus duplicates for many counties), heavy emphasis on modern (post-1950) material but plenty of earlier covers as well including DPO's, advertising, each cover mounted and written up with dates of operation for the post office, most covers fine to very fine or better, unlikely to be any great rarities but still an extraordinary amount of material which would be nearly impossible to duplicate, viewing highly recommended