These incredible N+M (Naturwissenschaft und Medizin) covers are from ekusupo on Flickr. They were apparently designed by Erwin Poell but I couldn’t find any more information on him to post along with the images. At any rate, this is some classic design done to perfection. Ekusupo says of them on the Flickr page:
"I share these as one of the best examples of graphic design as a methodic communications system I am aware of. Engaging and varied, as singles or as a set work tremendously well. The inside of the magazine may be considered disappointing if you want more of the same as the cover – but actually is delightful simple. The cover does its job really well selling the contents while the contents is true unto itself."
Indeed, this set is an amazing triumph of design for many reasons. You may recognize the name and some of the images from the Graphis Diagrams book.