Illustrated 'N.S.F. Juan Fernandez Islands Expedition 1965 Chilean' cover franked with 1964 4c blue (SG 549) tied by JUAN FERNANDEZ cds with red 'N.S.F. Juan Fernandez Islands Expedition' cachet on front and large 'UNITED STATES ANTARCTIC RESEARCH PROGRAM NATIONAL SCIENCE FOUNDATION U.S.N.S. Eltamin The USARP Research Vessel' cachet on reverse. Addressed to USA.