ial is protected as work product is governed by federal law even if the case is in court solely on grounds of diversity of citizenship.") J. FN6. Musselman I Phillips, 176 F.R.D. 194, 195 n. 1 (D.Md.1997) (collecting luthority); Nutramax Labs., Inc. . Twin Laboratories Inc., 183 F. .D. 458, 463,