@book{ BA50781473, author = "Cohen, R. L. (Ruth Louisa)", title = "Factors affecting the price of potatoes in Great Britain", publisher = "W. Heffer", year = "1930", series = "University of Cambridge, Department of Agriculture, Farm Economics Branch report", number = "Report no. 15", URL = "https://ci.nii.ac.jp/ncid/BA50781473" }