TY  - RPRT
TI  - Letter Circular 496: structural clay products, stone, and masonry: technical publications by members of the staff of the National Bureau of Standards
PY  - 1937
PB  - National Institute of Standards and Technology
CY  - Gaithersburg, MD
SN  - LCIRC 496r1937
DO  - 10.6028/NBS.LCIRC.496r1937
ER  -