(Simplified practice recommendation R61-30.) [Supersedes no. 61. Title on cover is: Clay tiles for floors and walls, elimination of waste through simplified commercial practice. Recommendation became effective Oct. 15, 1930.]
Notes:
(Simplified practice recommendation R61-30.) [Supersedes no. 61. Title on cover is: Clay tiles for floors and walls, elimination of waste through simplified commercial practice. Recommendation became effective Oct. 15, 1930.] * For Sale by Superintendent of Documents. Paper, 10c.
Availability:
* For Sale by Superintendent of Documents. Paper, 10c.