A Big Little Book flipper Killer Whale Trouble

A rare flipper collectible this is a Whitman Big Little Book. At 5" by 3 3/4" it is a rather small book. And at 39 cents a little price. There is an illustration on every other page and let us just say it is light reading.
It is the usual flipper fare as they take time out from the plot to watch a manta ray.
Anyway the plot is that they run across an albino killer whale which becomes friends with flipper and saves the boys after they kill a hammerhead shark as that causes a hammerhead shark feeding frenzy.
The copyright is 1967.