The Blue-Blazed Hiking Trail system, managed by the Connecticut Forest & Park Association (CFPA), and the related trail systems documented in the two volume ("East" and "West") 19th Edition of the "Connecticut Walk Book" comprise over 800 miles of hiking trails in Connecticut. The Blue-Blazed Hiking Trails are sometimes referred to by the acronym 'BBHTs'. The Blue-Blazed Hiking Trails and other trail systems listed in the Connecticut Walk Books by the Connecticut Forest & Park Association are also known as the 'Connecticut 400' for their total length in miles in the early 1970s.