The same desire for an immediate cash crop which was the incentive to raise flax on the pioneer farms was largely responsible for the introduction of potatoes and sugar beets. Potatoes had almost always been raised for local consumption, but no effort was made to produce them in commercial quantities. Then a few enterprising farmers in the Red River Valley planted large acreages, and were successful in marketing the crops outside the State. Because of their high flavor, mealiness, and large uniform size, these northern potatoes command a premium on the market. One warehouse specializes in the shipping of hand-picked, wrapped potatoes, packed like apples or oranges, for sale to railways and other markets demanding fancy-grade potatoes. It is, however, for their seed value that North Dakota potatoes are noted. Their low fiber content makes them ideal seed stock, and under Federal and State supervision they are certified for this purpose. In 1934 North Dakota produced 6,140,254 bushels of seed potatoes. Exports that year totaled 8,390 carloads. Experimentation showed that the soil which was good for northern potatoes was also excellent for sugar beets. The first crop of beets large enough to be listed in statistics for the State was 24,474 tons, harvested in 1924. By 1929 the tonnage had increased to 59,104. This is one crop which showed an increased production even in the dry year of 1934, when production totaled 82,304 tons, and beets were raised on 13,466 acres on 485 farms. When the industry was first introduced, most of the labor was performed by Mexicans. Under contract to beet farmers, trainloads of these people came north each spring. Not only did they work for very low wages, but they also developed a quality of work rarely equaled by white beet workers. The cultivation and weeding of sugar beets is done almost entirely by hand, a long tedious process in the blazing sun, which the Mexican worker seemed to mind not at all. In the fall, most of them would pack their families into second-hand cars purchased with their summer earnings, and return south. Difficulties of these workers in adjusting themselves to northern modes of living discouraged the use of Mexican labor, however, and today only a few of the larger farms still employ it. Most of the work is now carried on by local labor, often by school children. In driving through the Red River Valley, one can tell the farms on which sugar beets are a crop of many years' standing, for scarcely one of these is without an old tar-paper shack, a cook car remodeled into a house, or some other crude dwelling which was once the home of a family of Mexicans. In otherwise well-kept farmyards, where the buildings are comparatively modern, these laborers' dwellings are very decrepit and out-of-place.