共 50 条
- [2] HOW MUCH PROGRESS HAS BEEN MADE IN THE STUDY OF THE DEMAND FOR FARM PRODUCTS? [J]. JOURNAL OF FARM ECONOMICS, 1955, 37 (05): : 968 - 974
- [3] HOW MUCH EAR PROTECTION [J]. JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA, 1959, 31 (01): : 129 - 129
- [10] UVA protection - How much is enough? [J]. PIGMENT CELL & MELANOMA RESEARCH, 2008, 21 (02) : 295 - 295