This is Giant Adventure Comics 1, published by Mimosa (SA Magazine Co) +/- 1962.
It reprints the cover and all three stories from DC Comics' Adventure Comics 279 (1960):
"Superboy visits the 50th Century"
"The Sacrifice of Congorilla"
"Silly Sailors of the Sea"
Also reprinted are these three stories from DC Comics' Adventure Comics 193 (1953):
"Superboy's Lost Costume"
"Secret of the Sea Monster"
"Thunderbolts on Mount Olympus"
48pages, glossy colour cover, black and white newsprint interior.
Here is the cover of issue 1 and DC Comics' original cover: