|
Institute for Energy Research (United States)
156
|
Fraser Institute (Canada)
40
|
National Bureau of Economic Research (United States)
16
|
|
Mathematica Policy Research (United States)
9
|
RAND Corporation (United States)
7
|
Brookings Institution (United States)
2
|
|
American Enterprise Institute (United States)
1
|
Carnegie Endowment for International Peace (United States)
1
|
Centre for Economic Policy Research (United Kingdom)
1
|
|
Resources for the Future (United States)
1
|
