I'm not entirely certain what this UFO book is exactly; the site where I discovered it had it listed as a French (though it looks - as a couple folks have pointed out - Italian) "Photo-novel, presumably an adaptation of the episode, "A Question Of Priorities." But any piece of UFO artwork that has Straker punching out an alien astronaut on the moon - without a space suit! - is just too friggin' cool not to post here at Space: 1970.
Man, Straker is a badass.
ADDENDUM: According to Space: 1970 reader Roberto Baldassari, 18 photo-novelizations from UFO were released in Italy In 1974. Seven of them were also released in France. This appears to be one of the Italian editions. My question is: how much of a badass is Straker on the other covers?