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calcic horizon: The zone from 36 to 60 inches. (Bk1, Bk2, Bk3) <br />Particle size control section: The zone from 9 to 29 inches. (Bt1, Bt2, Btk) <br />Taxonomy version, 7th edition 1996 <br />ADDITIONAL DATA: Lab sampled S93CO083003. <br />National Cooperative Soil Survey <br />U.S.A. <br />(Revised June 2008) Attachment 2.04.9-3-6