In N.L.R.B. v. Brown Root, Inc., 311 F.2d 447, 454 (C.A. 8), it is said that "in a back pay proceeding the burden is upon the General Counsel to show the gross amounts of back pay due.
Holding that an "employer is not liable for back pay during the periods that an improperly discharged employee is unavailable to work due to a disability"