1. Balcke. 1944. Grundungung und kartoffelertrag. Mitt. f. die Landw. 59:257.
2. Barham, H. N., George Kramer, and G. N. Reed. 1943. Influence of various factors on the starch content of Kansas-grown potatoes and sweet potatoes. Jour. Agr. Res. 67: 395–406.
3. Brown, B. A. 1944. Soil-fertility experiments with potatoes. Amer. Potato Jour. 21: 163–169.
4. Brown, Bailey E. 1943. Ammonium nitrate as a source of nitrogen for potato fertilizers. Amer. Fertilizer 99, No. 5, 8–9.
5. — 1944. Use of ammonium nitrate in potato fertilizers. Amer. Potato Jour. 21: 1–5.