Full text of the Americans with Disabilities Act and its compliance guidelines are available on the ADA website. The United States Department of Justice Civil Rights Division, the office responsible for technical assistance and ADA enforcement, provides a PDF and HTML version of the most current ADA Standards for Accessible Design booklet under the "Design Standards" tab.
The ADA website also provides technical assistance materials that cover specific compliance issues, such as accessibility of swimming pools, working with service animals and compliance tips for small businesses. ADA compliance information is also available through the toll-free ADA hotline at 1-800-514-0301.
Similar information is available on the U.S. Access Board website. The site details accessibility guidelines for specific locations like hotels and bus platforms.