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61
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62Published 1990Government Document Book
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63
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64
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65by Scherocman, James A.Available online at Texas Transportation Institute Repository
Published 1990
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67
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68
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69
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70
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71
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72
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73
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74
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75Published 1988Government Document Book
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76Published 1980Government Document Book
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77
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78Published 1980Government Document Book
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79
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80