I probably didn't express myself well, maeve. The copyright date of 1980 given at the bottom of page 45 is for the song "Early Fields" only. The book itself has no indication of its printing date, just the 1971 copyright date on the title page. I'll see if I can find the ISBN on my original copy to compare against the one I gave above.

Just one Abebooks seller has a copy in stock right now and the listing really doesn't provide enough info to know if it's the original or a newer edition. I've messaged the seller to ask for the ISBN and distributor's name and I'll let you know what I hear back.