Dòng Nội dung
1
Out of the earth : civilization and the life of the soil / Daniel Hillel.
Berkeley : University of California Press, [1992]
x, 321 p. : ill., maps ; 23 cm.
2
Soils and environmental quality / by Gary M. Pierzynski, J. Thomas Sims, and George F. Vance.
Boca Raton : Lewis Publishers, 1994.
313 p. : ill. ; 25 cm.