1986 Arctic Explorers Plate Block Of 4 22c Postage Stamps - Sc 2220-2223 - MNH, OG - CX874
1984 Roanoke Voyages Block Of 4 20c Postage Stamps - Sc# 2093 - MNH, OG - CW34b
1983 Joseph Priestley Plate Block Of 4 20c Postage Stamps Sc# 2038 - MNH, OG - CW247a
1982 Ponce De Leon Block of 4 20c Postage Stamps - MNH, OG - Sc# 2024
1978 Captain James Cook Plate Block Of 4 13c Postage Stamps - MNH, OG - Sc# 1732 - CX336
1978 Captain James Cook Block Of 4 13c Postage Stamps - MNH, OG - Sc# 1732, 1733 - CX336a
1968 Marquette Explorer Plate Block Of 4 6c Postage Stamps - MNH, OG - Sc# 1356 - CX346
1968 Daniel Boone Plate Block of 4 6c Postage Stamps - MNH, OG - Sc# 1357
1967 Davy Crockett Plate Block of 4 5c Postage Stamps - Sc# 1330 - MNH, OG - CX485
1959 Arctic Explorations Plate Block of 4 4c Postage Stamps - Sc# - 1128 - MNH, OG - CX689
1959 Silver Centennial Plate Block of 4 4c Postage Stamps - Sc# - 1130 - MNH, OG - CX686
1950 California Statehood Gold Plate Block of 4 3c Postage Stamps - Sc 997 - MNH - DS136b
1954 Lewis & Clark Expedition Plate Block of 4 3c Postage Stamps - MNH, OG - Sc# 1063
1978 Captain James Cook Plate Block Of 4 13c Postage Stamps - MNH, OG - Sc# 1733 - CX327
1968 USA Leif Erikson Plate Block Of 4 6c Stamps - MNH, OG - Scott# 1359 - CX348
1969 John Wesley Powell Plate Block Of 4 6c Postage Stamps - MNH, OG -Sc# 1374 - CX359
