"De Groot, Mart" - 2 Text Results
| Title | Author | Domain | Publisher | Publication Year |
|---|---|---|---|---|
| Ernst Julius Opik. 1893-1985. The man and the scientist | Article in Journal | 1986 | ||
| The way to the stars : an introduction to astronomy in Armagh | De Groot, Mart | Monograph or Collective Volume | Armagh Observatory in collaboration with the Armagh District Council | 1990 |