Terrorism Prevention 1,298 Teachers Training of 821 Teaching Aids and devices 725 Teaching 718 Taxation Law and legislation 690 Trails 680 Technological innovations 661 Technology 638 Trigonometry 617 Taxation 612 Terrorism 604 Telecommunication 504 Thermodynamics 488 Tax administration and procedure 473 Theater History 397 Tourism 391 Technical education 389 Travel 388 Transportation and state 368 Theater 354 Transportation 352 Toxicology 344 Technology and state 302 Telecommunication systems 301 Transportation Planning 301 Texas 289 Technology Social aspects 287 Traffic safety 285 Tax returns 275 Tax credits 274 Technology transfer 260 Teachers 259 Teams in the workplace 251 Terrorism Prevention Government policy 243 Technological innovations Economic aspects 236 Telecommunication policy 235 Therapeutics 225 Thought and thinking 223 Teachers In-service training 220 Transparency in government Law and legislation 219 Teacher-student relationships 217 Trees 216 Technological innovations Management 210 Topology 206 Transportation Environmental aspects 203 Tissue engineering 202 Tax evasion 201 Timber 199 Thin films 196 Tax credits Law and legislation 195 Trials, litigation, etc 193 Telecommunication Law and legislation 191 Transparency in government 190 Teachers Rating of 188 Theater Production and direction 186 Terrorists 183 Time-series analysis 182 Transportation Law and legislation 179 Technological innovations History 177 Teaching Methods 172 Trade regulation 171 Traffic accidents 171 Telecommunication in medicine 169 Training of 167 Technology Study and teaching 165 Theology 165 Tibet Region 164 Tax incentives Law and legislation 162 Texas History 161 Terrorism Religious aspects Islam 159 Technical writing 155 Terminal care 153 Terrorism Prevention Finance 153 Terrorism Government policy 151 Theaters Stage-setting and scenery 151 Tales 147 Technical assistance, American 142 Transportation Finance 139 Trees Diseases and pests 139 Trails Law and legislation 138 Teacher effectiveness 137 Terrorism Prevention International cooperation 135 Tongass National Forest (Alaska) 135 Tribology 134 Twenty-first century 133 Three-dimensional imaging 132 Tax collection 131 Tariff Law and legislation 129 Text processing (Computer science) 129 Total quality management 125 Trusts and trustees 125 Technology and civilization 121 Turbulence 120 Telephone Law and legislation 118 Tax incentives 117 Trace elements in water 111 Textile fabrics 108 Texas Description and travel 107 Terrorism Finance Prevention 106 Traffic engineering 106