1983 Joseph Priestley Single 20c Postage Stamp - Sc# 2038 - MNH,OG
1949 Wright Brothers Airmail Single 6c Postage Stamp - Sc C45 - MNH, OG - CW400b
1968 Leif Erikson Single 6c Postage Stamp - MNH, OG - Scott# 1359 - CX348
1993 Columbus Landing in Puerto Rico Single 29c Postage Stamp - MNH, OG - Sc# 2805
1984 Roanoke Voyages Single 20c Postage Stamp - Sc# 2093 - MNH, OG - CW34b
1968 Marquette Explorer Single 6c Postage Stamp - Sc# 1356 - MNH,OG
1933 Byrd Antarctic Expedition Single 3c Postage Stamp - Sc#733 - MNH,OG
1959 Artic Exploration 1909 Single 4c Postage Stamp - Sc#1128 - MNH,OG
1998 Klondike Gold Rush Single 32c Postage Stamp -Sc# 3235 - MNH,OG
1982 Ponce DeLeon Single 20c Postage Stamp - Sc# 2024 - MNH,OG
Single 1999 California Gold Rush Single 33c Postage Stamp - Sc# 3316 - MNH,OG
1992 Juan Rodriguez Cabrillo Single 29c Postage Stamp - Sc# 2704 - MNG,OG
1969 John Wesley Powell - 1869 Expedition - Single 6c Postage Stamp - Sc# 1374 - MNH,OG
1954 Lewis & Clark Expedition Single 3c Postage Stamp - MNH, OG - Sc# 1063
1968 Daniel Boone Single 6c Postage Stamp - MNH, OG - Sc# 1357
1999 California Gold Rush Plate Block of 4 33c Postage Stamps - MNH, OG - Sc# 3316
1992 Juan Rodriguez Cabrillo Plate Block of 4 29c Postage Stamps - MNH, OG - Sc# 2704
2004 Lewis & Clark Plate Block of 4 37c Postage Stamps - Sc# 3854 - MNH - CX796
1998 Klondike Gold Rush Plate Block of 4 32c Postage Stamps - MNH, OG - Sc# 3235
1949 Wright Bros Airmail Block Of 4 6c Postage Stamps - Sc# C45 - MNH - CW400c
1993 Columbus Landing in Puerto Rico Block of 4 29c Postage Stamps - MNH, OG - Sc# 2805
1993 Columbus Landing in Puerto Rico Plate Block of 4 29c Postage Stamps - MNH, OG - Sc# 2805
1988 Arctic Explorers Block of 4 25c Postage Stamps - MNH, OG - Sc# 2386
1984 Roanoke Voyages Plate Block Of 4 20c Postage Stamps - Sc# 2093 - MNH, OG - CW34a
