I have 6 of the cards you need: #'s48, 126, 134, 144, 152 and 180 (R. Roberts).
Here's cards I need f/'56T: 2, 5, 6, 9-12. 20, 30, 31, 33-36, 40, 42, 52, 55, 56, 58, 63, 65, 67, 79-81, 85, 88, 95-97, 99, 101, 105, 107, 111, 113, 115, 118, 121, 122, 125, 128, 131, 135, 138-140, 145-147, 150, 151, 153, 154, 156, 158-161, 163-167, 172, 173, 177-179, 181, 182, 184, 186-190, 195, 196, 200, 203, 204, 206, 207, 209, 214, 216, 218, 221-227, 229-235, 237, 239, 240, 243, 248-251, 258, 260, 261, 265, 268, 276, 277, 280, 283-285, 287-293, 295, 298-302, 305-309, 312, 314, 319-321, 324-327, 329, 332, 334 and 340.
See if you can figure out an even swap, provided you have some '56's to trade.
jmcilvaine@mariners.com