TY  - RPRT
TI  - Letter Circular 502D: rain penetration in walls, waterproofing of masonry walls and the properties of joints in masonry in relation to low-cost housing
PY  - 1937
PB  - National Institute of Standards and Technology
CY  - Gaithersburg, MD
SN  - LCIRC 502D
DO  - 10.6028/NBS.LCIRC.502D
ER  -