00268nam a22001097a 4500003000400000008004100004082001800045100002200063245002000085260004500105300000800150OSt240209b        |||||||| |||| 00| 0 eng d  a631.417bS78H  aStevenson, F. J.   aHumus chemistry  aNew YorkJJohn Wiley and Sons Ltd.c1982  a443