首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   2144篇
  免费   79篇
  2023年   14篇
  2021年   10篇
  2020年   32篇
  2019年   46篇
  2018年   82篇
  2017年   67篇
  2016年   82篇
  2015年   57篇
  2014年   51篇
  2013年   593篇
  2012年   85篇
  2011年   93篇
  2010年   75篇
  2009年   73篇
  2008年   52篇
  2007年   67篇
  2006年   62篇
  2005年   30篇
  2004年   22篇
  2003年   21篇
  2002年   19篇
  2001年   19篇
  2000年   19篇
  1999年   27篇
  1998年   13篇
  1997年   17篇
  1996年   20篇
  1995年   15篇
  1994年   14篇
  1993年   21篇
  1992年   15篇
  1991年   21篇
  1989年   10篇
  1988年   16篇
  1987年   18篇
  1986年   23篇
  1985年   17篇
  1984年   16篇
  1983年   20篇
  1982年   24篇
  1981年   21篇
  1980年   14篇
  1979年   15篇
  1978年   14篇
  1977年   13篇
  1976年   15篇
  1975年   15篇
  1973年   11篇
  1969年   11篇
  1967年   15篇
排序方式: 共有2223条查询结果,搜索用时 15 毫秒
991.
992.
The Transformation of the Caspian Sea   总被引:1,自引:0,他引:1  
The author reviews the problem of the level fluctuations of the Caspian Sea, particularly the steady drop since 1929. The drop in level is affecting many key sectors of the regional economy. Among several remedial schemes is a plan for diverting the rivers of northern European Russia to the Caspian, and a project for a localized regulation of the level of the Caspian Sea.  相似文献   
993.
A complete climate section of a national atlas should contain maps, tables and graphs presenting data on climate-forming factors, the temperature regime, moisture supply, climatic regions and typical weather situations. Published national atlases are analyzed and recommendations for the treatment of climate are made. Particular importance is attached to the integrated presentation of several climatic elements on a single map. The value of climatic maps for various segments of the economy (agriculture, construction, transportation) is emphasized.  相似文献   
994.
The paper describes an attempt to determine the causes of the development of the present gully network in the steppe and forest-steppe of the European part of the USSR. The authors develop a technique that involves comparing the number of gullies derived from a map of gully density with the number of gullies derived from data on the expansion of the cropland area within the boundaries of the prerevolutionary guberniyas (major civil divisions). The authors conclude from the close correspondence of the two sets of figures that the great majority of gullies could have been formed as a result of the plowing up of the land over the 150 to 300 years of agricultural land use in the study region and can therefore be assumed to have arisen as a result of human activities.  相似文献   
995.
A plea for greater geographer participation in the field of regional and urban planning, which is concerned with selection of building sites for industry, urban and rural settlements, resorts, and tourist centers, the provision of means of transportation, water supply, and other utilities, and other local planning problems. Regional planning is said to offer an ideal field of application for geographic thinking and methods.  相似文献   
996.
Professor Semevskiy, who is visiting professor at the University of Havana lists the proceedings of monthly geographic meetings in the Cuban capital. His previous report on geography at the University of Havana appeared in Soviet Geography, November 1963.  相似文献   
997.
This report of the Permanent Commission on Landscape Maps of the Geographical Society USSR defines four groups of landscape maps and their basic mapped objects, ranging from detailed, large-scale facies maps (1:10,000) to small-scale maps of less than 1:1,000,000 showing mainly landscapes (in the sense of a given rank of natural areal unit). The report defines various physical-geographic units, such as facies, urochishche and mestnost' and the Russian terms have been retained where the meaning is ambiguous and there is no clear-cut English equivalent. The report also discusses various ways of formulating map legends. A previous paper on landscape mapping appeared in Soviet Geography, February 1961, pp. 34–47.  相似文献   
998.
A previous report on the discussion at the defense of the dissertation, by Yu. G. Saushkin, appeared in Soviet Geography, January 1963, pp. 53–59.  相似文献   
999.
An article published in Economic Geography, 1962, No. 1, by Prof. Yu. G. Saushkin of Moscow University in criticized by nine other Soviet economic geographers for alleged failure to give an objective appraisal of the current state of economic geography in the Soviet Union.  相似文献   
1000.
The geography faculties of Moscow and Leningrad universities have, in general, been on opposite sides of the dispute over the Anuchin book, with Moscow geographers supporting the concept of the unity of geography, and the Leningraders opposed. The following letter is designed to show that at one time members of both faculties carried on discussion on that issue in a constructive spirit.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号