TY  - RPRT
TI  - Letter Circular 168: addresses of sources of publications issued by the lime, gypsum and sand-lime brick section
PY  - 1925
PB  - National Institute of Standards and Technology
CY  - Gaithersburg, MD
SN  - LCIRC 168
DO  - 10.6028/NBS.LCIRC.168
ER  -