How can I get a copy of this book?

Unfortunately they’re no longer for sale.

But since it’s in the collection of the National September 11th Memorial & Museum, I can see it there?

While the book as well as one of its press sheets is indeed in the museum’s permanent collection, the works are not currently on display in the galleries.

So I just noticed that another page on this site says that Peace Brigades International received all of the sales proceeds… but then the book says that proceeds were divided between PBI & DoubleTake Magazine. Which one’s the case?

Very unfortunately, DoubleTake was about to close when I informed them I was about to send them a check; at their request, PBI received their portion of the book’s profits.