Note on back: "Dr. Larry Gusta, Crop Development Centre, in a controlled environment room, checks to see how cold-hardy winter wheat is doing after being exposed to a range of freezing temperatures in a special freezer and then re-planted for three weeks. The labels indicate the variety of the plants and the temperatures to which they were exposed. During the past fall, with the help of technicians, Dr. Gusta froze and re-planted some 40,000 plants".