TY  - RPRT
TI  - Letter Circular 915: painting exterior walls of porous masonry (superseding Letter Circular 747)
AU  - Sentel, Clara
PY  - 1948
PB  - National Institute of Standards and Technology
CY  - Gaithersburg, MD
SN  - LCIRC 915
DO  - 10.6028/NBS.LCIRC.915
ER  -