cover Trans-Mississippi Exposition postal cards, 1898, beautifully mounted collection of complete used and unused sets of ten multicolor official Exposition postal cards (twenty cards in all), USPCC #EX89-98 (some cards are the 'a' listings), all are no. UX14 postal cards, all of the designs in the unused set are exceptionally fresh and clean, the used set is all from the same correspondence to Italy, each additionally franked with a 1c Green (279), all cards with corner mount marks on the address side, some of the used cards with faint toning only on the address side (design side unaffected),