Historic information can be found at this link: Horseman History
A book on these wonderful birds titled "Horseman, the Thief Pouter", by James Dolier can be purchased at the following links: James Dolier (UK), Foy's Pigeon Supplies (US)
An online chat room frequented by breeders and flyers of working type Horseman Thief Pouters, as well as a few who breed show type Horseman, can be accessed at this link: All Flying Cropper Club
Another online chat room frequented by a few breeders and flyers of working type Horseman Thief Pouters, as well as a few who breed show type Horseman, can be accessed at this link: Edinburgh Doos
A club devoted to show type Horseman may be found at this link: National Horseman Pouter Club
A club devoted to flying type Horseman can be found at this link: International Horseman Thief Pouter Club