RYAN J, ESTEFON G, . (2007). SOIL PLANT ANALYSIS LABORATORY MANUAL. JODHPUR: SCIENTIFIC PUBLISHERS.
RYAN J, ESTEFON G, . 2007. SOIL PLANT ANALYSIS LABORATORY MANUAL. JODHPUR: SCIENTIFIC PUBLISHERS.
RYAN J, ESTEFON G, . SOIL PLANT ANALYSIS LABORATORY MANUAL. JODHPUR: SCIENTIFIC PUBLISHERS. 2007.