0001047469-02-001561 SC 13G/A 1 20020212 BHA GROUP INC 0000801128 3564 431416730 DE 0930 SC 13G/A 34 005-38753 02537596 8800 E 63RD ST KANSAS CITY MO 64133 8163568400 8800 E 63RD STREET KANSAS CITY MO 64133 DIMENSIONAL FUND ADVISORS INC 0000354204 0000 22370029 IL 1231 SC 13G/A 1299 OCEAN AVE 11TH FLOOR SANTA MONICA CA 90401 3103958005 1299 OCEAN AVENUE 11TH FLOOR SANTA MONICA CA 90401 SC 13G/A 1 doc1.txt 2001 SCHEDULE 13G/A - BHA GROUP HLDGS INC