This is Giant Action Comics 2, published by Mimosa (SA Magazine Co) +/- 1963-1964.
It reprints the cover and both stories from DC Comics' Action Comics 271 (1960):
"Voyage to Dimension X"
"Supergirl's Fortress of Solitude"
Also reprinted is this story from DC Comics' Action Comics 240 (1958):
Congo Bill: "Trapped in the Insect World"
Also reprinted are these two stories from DC Comics' Action Comics 203 (1955):
"The International Daily Planet!"
Tommy Tomorrow: "The Answer Man of Tomorrow"
48pages, glossy colour cover, black and white newsprint interior.
Here is the cover of issue 2 and DC Comics' original cover: