58 Pa. Code § 137.15
The provisions of this § 137.15 adopted June 3, 1971, effective July 3, 1971, 1 Pa.B. 1474; amended July 6, 1979, effective September 1, 1979, 9 Pa.B. 2264; amended July 10, 1981, effective July 11, 1981, 11 Pa.B. 2491; amended September 17, 1982, effective September 18, 1982, 12 Pa.B. 3295; amended September 16, 1983, effective September 17, 1983, 13 Pa.B. 2839; reserved June 19, 1987, effective July 1, 1987, 17 Pa.B. 2464. Immediately preceding text appears at serial pages (83616) to (83620).