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Recently changed regulations, later integrated into the Code of Federal Regulations. Holdings since 1936 on microfilm. Full text access through HeinOnline Academic.
Citation example: 57 FR 18418
DOC. AE 2.106/3:
Code of Federal Regulations (CFR)
Codification of the general and permanent rules published in the Federal Register by the executive departments and agencies of the Federal Government. A subject index to all sections is shelved at the Floor 4 Documents shelves under the call number AE 2.106/3:[year]. Full text access through HeinOnline Academic.