TY  - RPRT
TI  - Letter Circular 138: publications relating to building materials, construction, and building codes
PY  - 1926
PB  - National Institute of Standards and Technology
CY  - Gaithersburg, MD
SN  - LCIRC 138r1926
DO  - 10.6028/NBS.LCIRC.138r1926
ER  -