Limit by calendar year: 2011 All
| Zhang_Heng.pdf | 916 |
| Zhang_Heng.pdf.txt | 9 |
| May 2011 | June 2011 | July 2011 | August 2011 | September 2011 | October 2011 | November 2011 | December 2011 | January 2012 | February 2012 | March 2012 | April 2012 | May 2012 | |
| Zhang_Heng.pdf | 1 | 21 | 11 | 6 | 14 | 4 | 15 | 11 | 20 | 16 | 56 | 58 | 43 |
| Zhang_Heng.pdf.txt | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 1 | 4 | 1 | 1 | 1 |
| Ocean electric energy extraction opportunities | 453 |
| United States of America | 160 |
| Korea | 86 |
| China | 27 |
| United Kingdom | 13 |
| India | 11 |
| Spain | 10 |
| Sweden | 9 |
| Brazil | 8 |
| Ireland | 8 |
| Australia | 7 |
| Seoul | 76 |
| 26 | |
| Corvallis | 14 |
| Washington | 13 |
| Beijing | 11 |
| Vancouver | 10 |
| Limerick | 5 |
| Toledo | 5 |
| Arcata | 4 |
| Bend | 4 |