Forestry and Environmental Resources - 1973 Buol, S. W., Hole, F. D., & McCracken, R. J. (1973). Soil genesis and classification (1st ed.). Ames: Iowa State University Press. SANCHEZ, P. A., RAMIREZ, G. E., & CALDERON, M. V. (1973). RICE RESPONSES TO NITROGEN UNDER HIGH SOLAR-RADIATION AND INTERMITTENT FLOODING IN PERU. AGRONOMY JOURNAL, 65(4), 523–529. https://doi.org/10.2134/agronj1973.00021962006500040001x Powell, R. A. (1973). A model for raptor predation on weasels. Journal of Mammalogy, 54, 259–263. https://doi.org/10.2307/1378888