Stated First Edition. Tight, clean, flat, square, sharp and crisp book in pristine DJ under mylar. Laid in gift note from WIllard Seiberling to his brother Pen[field] both sons of FA Sieberling (founder of Goodyear) and brother to Senator Frank Seiberling, dated Christmas 1967. 

Penfield was a close friend with popular explorer and traveler Richard Halliburton, whose popular travelogues remain popular, and this book clearly came from his library. 

The Ever Changing Sea is the first book to make available the new facts about the seven seas, to trace the fascinating studies of men like Maurice Ewing, Hans Pettersson and Columbus Iselin, whose work has turned upside down the ancient notions of the silent, changeless sea.