When I was at primary school in the 80's the school library had a selection of young reader sci fi books that were part of a series. I think the books were colour coded for difficulty with purple or orange bars on the cover. They were thin and about A5 in size, in the format of a graphic novel, the artwork was black and white and involved a sort of exploration team, possibly lunar or interplanetary. From memory they spent a lot of time on the surface in space suits in craters and on rovers etc.
Any ideas?
Any ideas?