You'd think! I'ts been on my to-read list for years but my SF to-read list is literally decades behind at this point. So. And it's not a thing that turns up at used book sales (probably it's so good that people hoard copies?) and it's old enough that it would've been out of the local libraries by the time I started devouring SF, so I missed it in my read-ten-sf-books-a-week days.