Stamps, hydrogen atom & Niels Bohr design
1 to 4 of 4
Denmark
postage1963, Nov 21 Bohr theory 50th issue unwmk p. 12.75
| X | 35o | redbrn | hydrogen atom & Niels Bohr | |||
| X | 60o | dkbl | hydrogen atom & Niels Bohr |
Greenland
1963, Nov 21 Bohr theory 50th issue
| X | 35 | redbrn | hydrogen atom & Niels Bohr | |||
| - | 60o | dkbl | hydrogen atom & Niels Bohr |
1 to 4 of 4