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In addition to turquoise, the use of other local stone is permitted. Turquoise, if used, must be genuine stone, uncolored by any artificial means.
This is a list of United States Code sections, Statutes at Large, Public Laws, and Presidential Documents, which provide rulemaking authority for this CFR Part.
This list is taken from the Parallel Table of Authorities and Rules provided by GPO [Government Printing Office].
It is not guaranteed to be accurate or up-to-date, though we do refresh the database weekly. More limitations on accuracy are described at the GPO site.
§ 305a - Promotion of economic welfare through development of arts and crafts; powers of Board
§ 305b - Rules and regulations; submission to Secretary of the Interior