304 | 1857 | 5/28/1981 | Rachel Carson, set of 7 with same cachet and different cancels (machine cancel, 2 hand cancels on cards (1 is dual UO Slippery Rock PA), 1 card with UO Springdale PA slogan cancel, 1 add-on by MAXIE dual UO Slippery Rock PA, 1 UO Springdale PA slogan cancel dual UO Slippery Rock PA, 1 UO Beaver PA dual UO Beaver Falls PA) | $45.00 |