Pessi, Yrjö. “The Effect of Claying Carried Out in 1923 Upon the Thermal Conditions in Cultivated Sphagnum Peat Soil in the Summer of 1959”. Agricultural and Food Science 32, no. 1 (January 1, 1960): 1–4. Accessed November 27, 2024. https://journal.fi/afs/article/view/71508.