505811 also shows up on amazon books with the same descriptor.
pink tetrahedron hats?
no idea but when zooming in on the white part which is east of the coordinates (in that photo) it seems like it could be. The isbn for that book doesn't seem to exist. I found 3 references, the original abebooks link posted by an anon, the amazon page, and in google books. All have the coordinates and same descriptors. The coordinates lead to the square area in the photo.
Thanks for the info