| PigeonLinks.com | ||
| Holle Croppedia Articles | ||
| PigeonMatters | ||
| Blue Pied Project | English | author: John Logemann |
| Overeating happens with Croppers and Pouters | English | author: John Logemann |
| The making of... the Holle Cropper | English | author: John Logemann |
| Preparing Holle Croppers for a show | English | author: John Logemann |
| Golden Rules to breeding of the Holle Cropper | English | author: John Logemann |
| Rachitis or Osteomalacia | English | author: John Logemann |
| Feeding young Holle Croppers by hand | English | author: John Logemann |
| Selecting your Breeders on Vitality | English | author: John Logemann |