Is Rule 803(10) supported by testimony as to the nature of recordkeeping?

Since Rule 803(10) is based on Rule 803(8), evidence submitted thereunder need not be supported by testimony as to the nature of recordkeeping. Likewise, since 803(7) is based on 803(6), such testimony is required before evidence may be received thereunder. See 4 Weinstein's Evidence, supra, P 803(7)(01) at 803-187. Cf. United States v. Rich, 580 F.2d 929, 938-39 (9th Cir.), cert. denied, 439 U.S. 935, 99 S.Ct. 330, 58 L.Ed.2d 331 (1978); United States v. De Georgia, 420 F.2d 889, 895-96 (9th Cir. 1969) (Ely, J., concurring).