Produced by 20th Century-Fox “Excellent study of the largest tidewater glacier In the world which discharges into the Gulf of Alaska. The ice river is shown moving down to the sea where It collapses, discharging tremendous chunks of ice — ■ Icebergs — an awesome phenomenon. “The two contradictory theories of iceberg formation due respectively to weight and pressure of water — are clearly presented. Commentary by Father Hubbard and Lowell Thomas is excellent and includes thunderous roar of iceberg formation. Photography excellent. “Excellent for geology courses at any age level. Suggested for Alaskan geography.” Advisory committee.