(Simplified practice recommendation R1-29.) [Supersedes no. 1. Title on cover is: Vitrified paving brick, elimination of waste through simplified commercial practice. Recommendation became effective May 1, 1929.]
Notes:
(Simplified practice recommendation R1-29.) [Supersedes no. 1. Title on cover is: Vitrified paving brick, elimination of waste through simplified commercial practice. Recommendation became effective May 1, 1929.] * For Sale by Superintendent of Documents. Paper, 10c.
Availability:
* For Sale by Superintendent of Documents. Paper, 10c.