This work is from the Library of Congress. According to the library, there are
no known copyright restrictions on the use of this work. Images submitted for copyright by Underwood & Underwood are in the public domain in the United States due to expiration or lack of renewal.
Images of Sir Esme Howard, The Right Honourable William Lyon Mackenzie King, and The Right Honourable Vincent Massey. From Library and Archives Canada which lists its copyright as expired [http://data4.collectionscanada.ca/netacgi/nph-brs?s1=Vincent+Mass
File usage
The following pages on the English Wikipedia use this file (pages on other projects are not listed):