共 50 条
- [21] TREND OF MORTALITY IN THE UNITED-STATES SINCE 1900 [J]. SOCIAL SECURITY BULLETIN, 1956, 19 (11) : 15 - 18
- [25] A BRIEFING BY THE UNITED-STATES AGRICULTURAL NEGOTIATOR [J]. US-CANADIAN AGRICULTURAL TRADE CHALLENGES: DEVELOPING COMMON APPROACHES, 1988, : 15 - 20
- [27] THE RATIONALITY OF UNITED-STATES AGRICULTURAL POLICIES [J]. JOURNAL OF FARM ECONOMICS, 1963, 45 (02): : 343 - 351
- [28] MICROCOMPUTERS - THE EDUCATIONAL SOFTWARE IN THE UNITED-STATES [J]. FUTURIBLES, 1982, (59) : 49 - 57
- [29] ORGANIZATION OF DEFENCE RESEARCH IN THE UNITED-STATES [J]. NATURE, 1955, 176 (4491) : 1012 - 1013
- [30] ORGANIZATION AND SUPPORT OF SCIENCE IN THE UNITED-STATES [J]. SCIENCE, 1945, 102 (2657) : 548 - 554