![]() | Advances in Organic Geochemistry 1968 : Proceedings of the 4th International Meeting on Organic Geochemistry, Held in Amsterdam, September 16-18 1968 |
![hidden image for function call](https://upload.wikimedia.org/wikipedia/commons/c/ca/1x1.png)
![]() | Advances in Organic Geochemistry 1968 : Proceedings of the 4th International Meeting on Organic Geochemistry, Held in Amsterdam, September 16-18 1968 |