全文获取类型
收费全文 | 8720篇 |
免费 | 405篇 |
出版年
2023年 | 41篇 |
2020年 | 124篇 |
2019年 | 186篇 |
2018年 | 502篇 |
2017年 | 403篇 |
2016年 | 502篇 |
2015年 | 193篇 |
2014年 | 176篇 |
2013年 | 2023篇 |
2012年 | 248篇 |
2011年 | 398篇 |
2010年 | 405篇 |
2009年 | 261篇 |
2008年 | 263篇 |
2007年 | 330篇 |
2006年 | 169篇 |
2005年 | 144篇 |
2004年 | 108篇 |
2003年 | 106篇 |
2002年 | 115篇 |
2001年 | 145篇 |
2000年 | 109篇 |
1999年 | 115篇 |
1998年 | 90篇 |
1997年 | 82篇 |
1996年 | 86篇 |
1995年 | 71篇 |
1994年 | 59篇 |
1993年 | 74篇 |
1992年 | 71篇 |
1991年 | 61篇 |
1990年 | 60篇 |
1989年 | 58篇 |
1988年 | 52篇 |
1987年 | 60篇 |
1986年 | 62篇 |
1985年 | 71篇 |
1984年 | 79篇 |
1983年 | 85篇 |
1982年 | 70篇 |
1981年 | 68篇 |
1980年 | 70篇 |
1979年 | 61篇 |
1978年 | 69篇 |
1977年 | 67篇 |
1976年 | 61篇 |
1975年 | 71篇 |
1974年 | 42篇 |
1973年 | 38篇 |
1972年 | 41篇 |
排序方式: 共有9125条查询结果,搜索用时 140 毫秒
41.
Brentonm M. BARR 《The Canadian geographer》1986,30(4):290-301
Global social, political, and economic change during the past quarter-century has been profound, particularly in major areas with languages different from those usually employed by Canadian geographers. Surveys by the author suggest that senior Canadian geography graduate students, however, are inadequately prepared to assimilate primary world sources of information, including the relevant research literatures (except those published in this country's two official languages), and that few geography departments any longer require competence in more than one language at any level of study. Nevertheless, geographers and their students could benefit in many ways from foreign language expertise. Suggestions are made whereby geography departments could reinforce their existing rigorous training programs with foreign linguistic and area competence. 相似文献
42.
43.
44.
45.
46.
47.
Henry W. Herzog Alan M. Schlottmann Donald L. Johnson 《Journal of regional science》1986,26(3):445-459
ABSTRACT. The premise of this paper is that one can discover much about the location determinants of high-technology industry by examining the location (migration) decision of workers with high-technology occupations. A model of the high-technology worker migration decision is developed that permits estimation of worker response to both personal and area characteristics, the latter chosen to mirror location factors often cited by high-technology firms as important for both the attraction and retention of their specialized work force. Logit estimates of this model between 1975 and 1980 are presented. The paper is concluded with a discussion of policy implications. 相似文献
48.
49.
50.