Table A3.
Materials summary.
| Item Type | Count |
|---|---|
| Journal Articles | 27,932 |
| Report | 197 |
| Book Section | 152 |
| Conference Paper | 66 |
| Newspaper Article | 57 |
| Preprint | 51 |
| Blog Post | 35 |
| Thesis | 27 |
| Magazine Article | 19 |
| Book | 18 |
| Case | 6 |
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.