TY - BOOK AU - Amundson, Ronald, ed. ED - Anniversary Retrospective Symposium on Factors of Soil Formation TI - Factor of soil formation: proceedings SN - 0891188045 U1 - 551.305 21st ed. PY - 1994/// CY - U.S.A PB - Soil Science Society of America KW - Singer KW - Michael, ed KW - Soil classification KW - Soil formation KW - Soil science ER -