| Views | |
| The National Science Foundation and the improvement of science teaching in the secondary schools | 157 |
| November 2012 | December 2012 | January 2013 | February 2013 | March 2013 | April 2013 | May 2013 | |
| The National Science Foundation and the improvement of science teaching in the secondary schools | 13 | 13 | 28 | 14 | 10 | 13 | 14 |
| Views | |
| LD2668R41972D55.pdf | 74 |
| Views | |
| United States of America | 43 |
| China | 39 |
| Russian Federation | 5 |
| Germany | 4 |
| Iran | 3 |
| Japan | 3 |
| Ukraine | 3 |
| Canada | 2 |
| Colombia | 1 |
| United Kingdom | 1 |
| Views | |
| Beijing | 30 |
| Washington | 14 |
| Gunzenhausen | 4 |
| Tehran | 3 |
| Moscow | 2 |
| Saint Petersburg | 2 |
| Toronto | 2 |
| Amsterdam | 1 |
| Bogotá | 1 |
| Hebei | 1 |