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    Transportation research circular ; 500.
    Progress report on maintenance and operations personnel ; 53.2000

    National Research Council, Committee on Maintenance and Operations Personnel, USA / Iowa, Department of Transportation / American Association of State Highway and Transportation Officials, Subcommittee on Maintenance | TIBKAT | 2000

    Transportation research circular ; 493.
    Progress report on maintenance and operations personnel ; 52.1999

    National Research Council, Committee on Maintenance and Operations Personnel, USA / Iowa, Department of Transportation / American Association of State Highway and Transportation Officials, Subcommittee on Maintenance | TIBKAT | 1999