TY  - RPRT
TI  - Letter Circular 502E: plumbing materials and equipment as related to low-cost housing
PY  - 1937
PB  - National Institute of Standards and Technology
CY  - Gaithersburg, MD
SN  - LCIRC 502E
DO  - 10.6028/NBS.LCIRC.502E
ER  -