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|  |  | County Boundary
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| | | Populated Places
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|  | 0 - 2,500
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|  | 2,500 - 10,000
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|  | 10,000 - 50,000
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|  | 50,000 - 100,000
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|  | 100,000 - 500,000
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|  | > 500,000
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| | | Roads
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|  | Primary - Interstate
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|  | Primary - Interstate; Underpassing
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|  | Primary - US Hwy
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|  | Primary - US Hwy; Alternate
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|  | Primary - US and State Hwy
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|  | Primary - US Hwy: Business
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|  | Secondary - State Hwy
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|  | Secondary - State Spur
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|  | Secondary - State and County Hwy
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|  | Secondary - State Loop
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|  | Secondary - State and County Hwy; in tunnel
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|  | Secondary - State and County Hwy; underpass
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|  | Access Ramp - Clover Leaf
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|  | Access Ramp - Unassociated
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|  | Secondary - State Hwy; Business
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|  | Traffic Circle
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|  | Local, Rural Road, City Street
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|  | Cul-de-Sac
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|  | Vehicular Trail - 4WD only
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|  | Service Drive
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|  | Ferry Crossing
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|  | Other thoroughfare - Major
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|  | Walkway
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|  | Alley
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| | | Rivers / Streams
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| | | Lakes / Reservoirs
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| | | City Limits
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| | | tx_dem_3s
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|  | High : 2661.64
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|  | Low : -5.32563
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| | | tx_hs_3s_z28
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|  | High : 254
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|  | Low : 0
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|  | High : 2599.25
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|  | Low : -1.13545
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|  | High : 254
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|  | Low : 0
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