Proof of citizenship, under sections 21 , 22 to 24 , 26 to 28 , 29 , 30 , 33 to 48 , 50 to 52 , 71 to 76 of this title and section 661 of title 43 , may consist, in the case of an individual, of his own affidavit thereof; in the case of an association of persons unincorporated, of the affidavit of their authorized agent, made on his own knowledge, or upon information and belief; and in the case of a corporation organized under the laws of the United States, or of any State or Territory thereof, by the filing of a certified copy of their charter or certificate of incorporation. (R.S. § 2321.) Editorial Notes References in Text Sections 21 , 22 to 24 , 26 to 28 , 29 , 30 , 33 to 48 , 50 to 52 , 71 to 76 of this title and section 661 of title 43 , referred to in text, were in the original “this chapter”, meaning chapter 6 of title 32 of the Revised Statutes, consisting of R.S. §§ 2318 to 2352. Codification R.S. § 2321 derived from act May 10, 1872, ch. 152, § 7, 17 Stat. 94 . CFR Title Parts 36 9 43 3710 , 3730 , 3800 , 3809 , 3810 , 3820 , 3830 , 3831 , 3832 , 3833 , 3838 , 3850