slope ramp design guideline for disable person/wheelchair - YouTube
ADA Handicap Ramp Slope: Get the Right Wheelchair Ramp Length
EZ-ACCESS PATHWAY 30 ft. Straight Aluminum Wheelchair Ramp Kit with Solid Surface Tread, 2-Line Handrails and 4 ft. Top Platform PS30S44T - The Home Depot
Building a Wheelchair Ramp: What you should know before tackling the project | Where It's AT. The Ability Tools Blog.