全文获取类型
收费全文 | 6203篇 |
免费 | 231篇 |
出版年
2020年 | 54篇 |
2019年 | 108篇 |
2018年 | 422篇 |
2017年 | 336篇 |
2016年 | 415篇 |
2015年 | 118篇 |
2014年 | 119篇 |
2013年 | 1437篇 |
2012年 | 148篇 |
2011年 | 306篇 |
2010年 | 298篇 |
2009年 | 180篇 |
2008年 | 174篇 |
2007年 | 232篇 |
2006年 | 106篇 |
2005年 | 91篇 |
2004年 | 81篇 |
2003年 | 77篇 |
2002年 | 63篇 |
2001年 | 81篇 |
2000年 | 63篇 |
1999年 | 76篇 |
1998年 | 63篇 |
1997年 | 52篇 |
1996年 | 49篇 |
1995年 | 40篇 |
1994年 | 27篇 |
1993年 | 67篇 |
1992年 | 42篇 |
1991年 | 38篇 |
1990年 | 42篇 |
1989年 | 47篇 |
1988年 | 40篇 |
1987年 | 49篇 |
1986年 | 40篇 |
1985年 | 45篇 |
1984年 | 42篇 |
1983年 | 58篇 |
1982年 | 48篇 |
1981年 | 48篇 |
1980年 | 55篇 |
1979年 | 40篇 |
1978年 | 50篇 |
1977年 | 58篇 |
1976年 | 59篇 |
1975年 | 42篇 |
1974年 | 32篇 |
1973年 | 35篇 |
1972年 | 37篇 |
1971年 | 33篇 |
排序方式: 共有6434条查询结果,搜索用时 15 毫秒
101.
James E. Payne 《Journal of regional science》1995,35(2):319-332
ABSTRACT This paper extends the research of Hyclak and Johnes (1989) in analyzing the relationship between the rigidity in real wages and state unemployment rates. It presents evidence contrary to the empirical findings of Hyclak and Johnes in that measures of real wage rigidity are not robust over time in explaining changes in state unemployment rates. Moreover, an alternative proxy accounting for divergent growth patterns across states does not significantly affect changes in state unemployment rates. 相似文献
102.
103.
104.
105.
Pedro Pérez Herrero 《Colonial Latin American Review》1995,4(1):217-232
Tráfico de Indias y política oceánica. By Fernando Bordejé Y Morencos. Madrid: MAPFRE, 1992. Pp. 341.
Relaciones económicas entre España y América hasta la independencia. By John R. Fisher. Madrid: MAPFRE, 1992. Pp. 280.
Las comunicaciones en América. By Secundino‐José Gutiérrez Alvarez. Madrid: MAPFRE, 1993. Pp. 424.
Piratas, bucaneros, filibusteros y corsarios en América. Perros, mendigos y otros malditos del mar. By Manuel Lucena Salmoral. Madrid: MAPFRE, 1992. Pp. 306.
El dinero americano y la política del imperio. By María Emelina Martín Acosta. Madrid: MAPFRE, 1992. Pp. 333.
Cargadores a Indias. By Julian B. Ruiz Rivera and Manuela Cristina García Bernal. Madrid: Mapfre, 1992. Pp. 395. 相似文献
106.
There is increasing concern about environmental impacts of acidic drainage from acid sulphate soils on Holocene estuarine flood plains. Acidity derives from oxidation of iron pyrite in the sediments. Natural factors determine concentrations and distributions of pyrite accumulations, but human activities have reduced pyrite accumulation in the Pearl River Delta with land use practices increasing terrestrial sediment discharge. Large freshwater discharges and management techniques have enabled sustainable use of these soils. High concentrations of pyrite occur in many estuarine flood plains of Australia because of relatively greater marine inputs. Drainage of these soils enhances pyrite oxidation and estuarine acidification, which is associated with fish-kills. For sustainable development, the problems of acid sulphate soil drainage must be recognised and overcome. 相似文献
107.
108.
109.
James C. Garman 《International Journal of Historical Archaeology》1998,2(2):133-160
Scholarship concerning the lives of enslaved African Americans in southern New England has shifted rapidly from outdated models of acculturation to conflict-driven models of domination and resistance. With the assumption of conflict as the outcome of all power relations, both economic production and historical contextuality have been overlooked, with slavery systems in New England simply equated with other regions of the Atlantic world, rather than compared and contrasted. This essay reconsiders contests over power in seventeenth- and eighteenth-century New England. Drawing on the work of Greene (1966), Piersen (1988), and others, I argue that the system of slavery in the region may represent an anomalous case in terms of the means of control or the means of resistance. By examining demographic patterns, economic production, and agricultural landscapes in Rhode Island's East Bay, I argue that there may be more to be learned from William D. Piersen's (1988, p. 143) concept of resistant accommodation as a middle ground between the two extremes of the theoretical spectrum. The essay concludes with suggestions for further research on the archaeology of African-American lives in the region. 相似文献
110.