- | 33c | multi | Rachel Carson | 14.5 | ||
- | 33c | multi | Ding Darling | 14.5 | ||
- | 33c | multi | David Brower | 14.5 | ||
- | 33c | multi | Jacques Cousteau | 14.5 | ||
- | 33c | multi | Roger Tory Peterson | 14.5 | ||
- | 33c | multi | Prince Philip | 14.5 | ||
- | 33c | multi | Joseph Wood Krutch | 14.5 | ||
- | 33c | multi | Aldo Leopold | 14.5 | ||
- | 33c | multi | Dian Fossey | 14.5 | ||
- | 33c | multi | Sir David Attenborough | 14.5 |
- | $2 | sheet | — | — |