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- [22] CODES OF CONDUCT FOR SUPPLIERS AND CONTRACTORS OF SPANISH MULTINATIONAL COMPANIES REVISTA GENERAL DEL DERECHO DEL TRABAJO Y DE LA SEGURIDAD SOCIAL, 2015, (40): : 1 - 44
- [25] CONTRACTORS MAINTENANCE NOTEBOOK - UNDERCARRIAGES HIGHWAY & HEAVY CONSTRUCTION, 1983, 126 (12): : 39 - 40
- [26] CONTRACTORS MAINTENANCE NOTEBOOK - SUMMER HIGHWAY & HEAVY CONSTRUCTION, 1984, 127 (04): : 61 - 62
- [27] How Iowa contractors and suppliers are surviving `Water 2000' Water Well Journal, 1997, 51 (08):
- [28] CONTRACTORS MAINTENANCE NOTEBOOK - WELDING HIGHWAY & HEAVY CONSTRUCTION, 1984, 127 (05): : 95 - 96
- [30] CONTRACTORS MAINTENANCE NOTEBOOK - BATTERIES HIGHWAY & HEAVY CONSTRUCTION, 1985, 128 (02): : 89 - 90