PT - JOURNAL ARTICLE AU - Johnson, S. W. TI - On nitrification AID - 10.2475/ajs.s2-47.140.234 DP - 1869 Mar 01 TA - American Journal of Science PG - 234--242 VI - s2-47 IP - 140 4099 - http://www.ajsonline.org/content/s2-47/140/234.short 4100 - http://www.ajsonline.org/content/s2-47/140/234.full SO - Am J Sci1869 Mar 01; s2-47