(Simplified practice recommendation R30-37.) [Supersedes R30-28. Recommendation became effective Nov. 1, 1937.]
Notes:
(Simplified practice recommendation R30-37.) [Supersedes R30-28. Recommendation became effective Nov. 1, 1937.] * For Sale by Superintendent of Documents. Paper, 5c.
Availability:
* For Sale by Superintendent of Documents. Paper, 5c.