共 50 条
- [21] Roles of surveyors in the forest service of the U.S. department of agriculture Surveying and Land Information Systems, 1993, 53 (04): : 236 - 237
- [24] Scope, characteristics, and use of the U.S. Department of Agriculture’s intramural research Scientometrics, 2011, 88
- [25] The New Counterinsurgency Era: Transforming the U.S. Military for Modern Wars RUSI JOURNAL, 2010, 155 (05): : 90 - 91
- [28] Transforming a U.S. scholarly concentrations program internationally: lessons learned BMC Medical Education, 19
- [29] Quantifying Structural Change in U.S. Agriculture: The Case of Research and Productivity Journal of Productivity Analysis, 2004, 21 : 297 - 315