全文获取类型
收费全文 | 34篇 |
免费 | 10篇 |
国内免费 | 79篇 |
专业分类
大气科学 | 6篇 |
地球物理 | 3篇 |
地质学 | 110篇 |
海洋学 | 2篇 |
天文学 | 1篇 |
自然地理 | 1篇 |
出版年
2021年 | 1篇 |
2003年 | 1篇 |
1995年 | 1篇 |
1994年 | 1篇 |
1988年 | 1篇 |
1966年 | 1篇 |
1965年 | 5篇 |
1964年 | 10篇 |
1963年 | 2篇 |
1962年 | 1篇 |
1961年 | 1篇 |
1959年 | 12篇 |
1958年 | 12篇 |
1957年 | 17篇 |
1956年 | 1篇 |
1955年 | 6篇 |
1954年 | 1篇 |
1942年 | 1篇 |
1941年 | 1篇 |
1940年 | 6篇 |
1939年 | 2篇 |
1938年 | 5篇 |
1937年 | 3篇 |
1936年 | 7篇 |
1935年 | 4篇 |
1934年 | 9篇 |
1933年 | 5篇 |
1932年 | 4篇 |
1930年 | 2篇 |
排序方式: 共有123条查询结果,搜索用时 15 毫秒
21.
ON A NEW OCHOTONID FROM NORTH SUIYUAN 总被引:1,自引:0,他引:1
In the course of the splendid summer trip which we enjoyed in the company of the American Central Asiatic Expedition in 1930, we, P. Teilhard de Chardin and myself, collected in the Late Tertiary Tung Gur basin (near Irdin Manha), some remains of Ochotonidae. Through the kindness of Drs. R. C. 相似文献
22.
23.
24.
Bordered by the Chungtiaoshan (中條山) on the North and the Tsinling (秦嶺) on the South, the area between Loyang and Sian, where the Huangho River hits and follows the old Weiho valley has been known for a long time to be specially rich in Cenozoic formations of different ages. These deposits are 相似文献
25.
The presence of Dicynodontia in Sinkiang was first made manifest by the beautiful skull described in the same number of the Bulletin, (see above 563) as Dicynodon sinkianensis sp. nov. Recently, a second skull also collected by 相似文献
26.
INTRODUCTION The Early Tertiary formations in China have not been studied systematically for a long time, since they are less well exposed and less fossilifer, ous than the Pliocene or Pleistocene beds in the same areas. No further re- 相似文献
27.
28.
29.
In the course of the past two years,when they were in the field with theThird American (1930) and the Haardt-Citroen (1931) Central Asiatic Expedi-tions,the authors of the present note had opportunities for making a series ofarchaeological observations ov 相似文献
30.