Twenty-one activities concerning where we are in space and time
| Údar corparáideach: | |
|---|---|
| Rannpháirtithe: | |
| Formáid: | LEABHAR |
| Teanga: | English |
| Foilsithe / Cruthaithe: |
Cambridge, MA
Harvard-Smithsonian Centre for Astrophysics
c1989.
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| Ábhair: |