From an old 1966 slide. Not long into the Spring Trip we had our first of many blizzards, and "blizz'd in" was the term. Typically, after waiting several days for the wind and drifting snow to finish came another day of digging out buried sledges and equipment before we could move. Here the pre-heater (the item with the large yellow tube) has been attached to one of the D4 tractors, which has the engine covered in the heating shroud. Best viewed on black (press Z).