 He wrote the non-fiction book "Marijuana Acquittal" among others.Upon his death in 1975, "Chatham Manor" and surrounding were bequeathed to the National Park Service, which now uses the estate for its headquarters facility in the Fredericksburg and Spotsylvania National Military Park as well as a free museum open to the public (but with more limited hours than the grounds and gardens).Pratt also willed a portion of the Chatham estate (an adjacent bluff overlooking the Rappahannock River) to the local community to be used as a park, and which was named in his honor.