49 C.F.R. § 551.31 Form of communications.
Title 49 - Transportation
Any communication in writing relating to official business (including formal documents) shall be on opaque and durable paper not larger than 9 by 14 inches in size. Tables, charts, or originals of other documents that are attached to communications shall be folded to this size, if possible. The left margin of communications shall be at least 1
Title 49: Transportation
PART 551—PROCEDURAL RULES
Subpart C—Submittals in Writing
§ 551.31 Form of communications.