I had not seen this Bolland cover before. It comes from a 2004 publication from TwoMorrows publishing who do some very interesting books and magazines about comics history. This one is now out of print although you can still find copies on some digital shelves. You can buy a digital copy direct from TwoMorrows themselves, and they have a pdf preview to check out on the site.
I’ve recently been reading their Comic Book Collector issue all about Swamp Thing and other comics muck men. Good stuff.