| Rec | Mtg# | Year | Authors | Institution | Talk title |
|---|---|---|---|---|---|
| 1 | 749 | 1955 | Zalman Samuel Altschuler; E. J. Young; Roy S. Clarke Jr. |
USGS | Uranium in apatite -- geologic aspects |
| 2 | 1042 | 1978 | Roy S. Clarke Jr. | National Museum of Natural History | Structure development in iron meteorites viewed through the ternary Fe-Ni-P system |
| 3 | 1103 | 1983 | Roy S. Clarke Jr. | National Museum of Natural History | Iron meteorites found in Antarctica |