TY  - RPRT
TI  - Letter Circular 169: miscellaneous publications of the lime, gypsum, and sand-lime brick section
PY  - 1925
PB  - National Institute of Standards and Technology
CY  - Gaithersburg, MD
SN  - LCIRC 169
DO  - 10.6028/NBS.LCIRC.169
ER  -