PKR51 The Parker 51 Book written by David and Mark Shepherd @2004. David Shepherd compiled the first published history of the Parker 51 using privileged information available only through private resources. This hardback book features over 700 color photographs complemented by authoritative information throughout it's 176 pages. This book has been much awaited and will be an important part of any serious pen collectors' library of reference materials. The ultimate guide to the Parker 51!