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  1. Technical Aspects of Asphalt Trail Design - American Trails

  2. Building Better Asphalt Trails

  3. Surfaces - Rails to Trails Conservancy

  4. FAQ: Is asphalt a good choice for a trail surface?

  5. Standard Trail Plans and Specifications - US Forest Service

  6. Developing Trails in Sensitive Areas - Rails to Trails Conservancy

  7. What Are the Best Surface Materials for Trails? - Trailsnet.com

  8. Which Multi Use Trail Materials Are Right for Your Project?

  9. Choosing Multi-Use Trail Surface Types: Gravel, Asphalt, Concrete

  10. 某些结果已被删除