This is a mistake,

From Author Wars - https://authorwars.com/books/this-is-a-mistake-2836100.html

Overview:

Title: This is a mistake,
Author: Margaret Atwood
Year: 1971
Type: Poems

Editions/Publications:

1996 . Power Politics (1996, Margaret Atwood, House of Anansi Press, ISBN-10: 0887845797, $9.95, 76 pages, Trade Paperback, Collection)