(Simplified practice recommendation R14-28.) [Title on cover is: Roofing slate, elimination of waste through simplified commercial practice. Recommendation became effective Feb. 1, 1928.]
Notes:
(Simplified practice recommendation R14-28.) [Title on cover is: Roofing slate, elimination of waste through simplified commercial practice. Recommendation became effective Feb. 1, 1928.] * For Sale by Superintendent of Documents. Paper, 5c.
Availability:
* For Sale by Superintendent of Documents. Paper, 5c.