5 L.Ed.2d 141, 20 Fed.R.Serv.2d 547 (Cite as: 422 U.S. 225, 95 S.Ct. 2160) Federal Rules of Civil Procedure, see Rule 26(b)(3), and in Rule 16 of the Criminal Rules as well, see Rules 16(b) and (c); cf. E. Cleary, McCormick. on Evidence 208 (2d ed. 1972). [17][18][19][20][21) Ths_privilege de- rived from tile