| Views | |
| The ancient drug opium | 100 |
| November 2012 | December 2012 | January 2013 | March 2013 | April 2013 | May 2013 | |
| The ancient drug opium | 12 | 8 | 17 | 7 | 17 | 10 |
| Views | |
| JulyanDircksenAncientdrug5-45-1-PB-1.pdf | 55 |
| Views | |
| United States of America | 46 |
| Canada | 20 |
| China | 13 |
| South Africa | 6 |
| United Kingdom | 5 |
| Australia | 2 |
| Brazil | 1 |
| Germany | 1 |
| Greece | 1 |
| India | 1 |
| Views | |
| Redwood City | 21 |
| Toronto | 20 |
| Beijing | 8 |
| Sayreville | 7 |
| Potchefstroom | 6 |
| Melbourne | 2 |
| Almada | 1 |
| Bloomington | 1 |
| Brasília | 1 |
| Busto Arsizio | 1 |