Volpe National Transportation Systems Center, Technical Reference Center;BTS Productshttps://doi.org/10.21949/15016211995PDFStatistical ReportGross, MarilynFeldman, RichardJohn A. Volpe National Transportation Systems Center (U.S.)United States. Department of Transportation. Bureau of Transportation StatisticsUnited States. Department of Transportation. Bureau of Transportation StatisticsUnited StatesAir pollutionAir transportationBus transportationEconomic factorsEmploymentEnergy consumptionExpendituresFreight trafficHazardous materialsHighway transportationInventoryOil spillsPerformancePipeline transportationPollutantsProductivityPublic transitRailroad transportationStatisticsTransportationTransportation safetyTravelTruckingVehiclesWater ...