These are great! As far as I understand with my poor italian, it was Esso's house organ indeed (existing from 1949-83), and they collaborated with artists for covers and inserts.There was an exhibition about it:http://www.fondazionemarch.org/collezione-essoWith a catalogue:http://www.amazon.de/Raccolta-Darte-Esso-1949-1983-Biographies/dp/8837056877
Some installation views from the exhibit: http://www.archilovers.com/p5795/mostra-la-raccolta-d-arte-esso-1949-1983
Ah cool, looks great. I like the huge monolith in the middle of the exhibit. I guess Ford Motors had a similar house journal in the states, illustrated by Charley Harper.
Any idea who the artist of the second cover is?
Hmmm, not sure, sorry.
Revisiting the page with the installation shots I just found out that the floor looks like an oil spill...
Yeah, you're right. Cool. Looks liquidy.