I see that the 2013 Kindle edition of H.P. Lovecraft: New England Decadent has vanished from Amazon UK and USA. The extended essay was an early and well-regarded examination of Lovecraft’s ‘decadent’-influenced period (which lasted to about 1926), both in his writing and life.
So it’s just as well I got the ebook when I did, back in 2013. Thankfully I find that it’s still on my Kindle, as the print-on-demand paper price is a bit steep.
Why has it vanished? Well, it was republished in a corrected form for WaterFire Providence in late summer 2013, as a fundraiser. So my guess would be that they were only permitted to offer it for a time-limited five-year period?