COLOMBIA, 1854-56 FOLDED LETTERS TO NEW YORK - BOTH WITH DOUBLE FORWARDERS, both from the Lanman correspondence, first with 1854 Bogota dateline with oval "Pedro Macia/Cartagena" forwarder's h.s., also red oval "T.R. Cowan / Navy Bay Chagres." forwarder's h.s., in addition weakly struck Boyd's City Post h.s., the second with 1856 Barranquilla dateline showing red oval Ramon Leon Sanchez, Cartagena forwarder's h.s., in addition to black oval "Druce, Eckhart Cartagena' forwarder's h.s., latter cover has bold "Steamship 20" rate marking upon arrival, fine-very fine, attractive pair of covers