Additions, changes and corrections to Canadian subject headings = Modifications, ajouts et corrections aux Canadian subject headings.
National Library of Canada.Canadian subject headings.cn
[Ottawa] : National Library of Canada,
1981.
Prefatory material in English and French.
Cover title.
"Canadian subject headings"
"Second supplement to Canadian subject headings, 1978 ... incorporating all items published in the first supplement, June 1980"-p. i.
Includes indexes in English and French.