分面浏览：发表日期 |
| 当前检索式 | ((ALL：natural resources)) |
| 限定条件 | 无 |
| 2024 23 | 2023 142 | 2022 253 |
| 2021 743 | 2020 899 | 2019 1156 |
| 2018 931 | 2017 1011 | 2016 752 |
| 2015 494 | 2014 506 | 2013 590 |
| 2012 519 | 2011 376 | 2010 460 |
| 2009 256 | 2008 196 | 2007 130 |
| 2006 119 | 2005 81 | 2004 57 |
| 2003 60 | 2002 36 | 2001 28 |
| 2000 17 | 1999 21 | 1998 21 |
| 1997 14 | 1996 10 | 1995 6 |
| 1994 5 | 1993 8 | 1992 3 |
| 1991 4 | 1990 3 | 1989 3 |
| 1987 2 | 1986 3 | 1985 1 |
| 1983 2 | 1981 1 |
