#	Letters of Interpretation
1	10/15/2024 - 1910.111 - Inspection Guidance for Animal Slaughtering and Processing Establishments
2	04/22/1999 - 1910.111(b)(12)(ii) - Clarification of the requirement for an attendant during transfer of anhydrous ammonia.
3	12/07/1998 - 1910.111 - Respiratory protection for anhydrous ammonia storage installations.
4	10/31/1996 - 1910.111 - Process Safety Management of Highly Hazardous Chemicals and process hazard analyses.
5	01/31/1991 - 1910.111(b)(7)(iv) - Back-welding of threaded connections in anhydrous ammonia service.
6	01/31/1991 - 1910.111, 1910.111(b)(7)(iv) - Back-welding of threaded connections in anhydrous ammonia service.
7	10/29/1986 - 1910.111(e) - Requirements relative to the use of anhydrous ammonia in Diazo Reproduction machines.
8	10/29/1986 - 1910.111(b) - Requirements relative to the use of anhydrous ammonia in Diazo Reproduction machines.