The early rapid cancelling machines of Canada /
Sessions, David F.
Kilish, Ted.
Canadian Philatelic Society of Great Britain.cn
Henbury, Bristol : Canadian Philatelic Society of Great Britain ; Toronto : Unitrade Associates,
1982.
Includes bibliographical references and index.
Cancelling machines.
Cancellations (Philately)
Oblitérateurs.
Oblitérations (Philatélie)