CFR > Title 29 - Labor > SUBTITLE B—Regulations Relating to Labor > CHAPTER XXVII—FEDERAL MINE SAFETY AND HEALTH REVIEW COMMISSION (parts 2700 to 2706) > PART 2700—PROCEDURAL RULES > SUBPART E—Complaints of Discharge, Discrimination or Interference (§2700.40 to §2700.45) > 2700.42—Contents of complaint.