A reader gets to the bottom of it:

“Derb—Though I strongly sympathize with your instincts regarding the poem and the PC tendencies of textbook authors and other educators, according to the notes at http://rpo.library.utoronto.ca/poem/2614.html the version your daughter brought home is the manuscript version. According to the RPO site (See http://rpo.library.utoronto.ca/poet/94.html for more info) the copyright for the manuscript versions is held by Harvard University Press, which may be a clue as to the version used.”

[Derb] Hmph again. I have “manuscript versions” of stuff I’ve written that I wouldn’t wish to see the light of day. They should give kids the BEST version; and even a 14-year-old can see that the one in the Oxford book beats the one given to the kids by a mile.