TY  - RPRT
TI  - Letter Circular 764: the care of floors (supersedes Letter Circular 388 and 627)
PY  - 1944
PB  - National Institute of Standards and Technology
CY  - Gaithersburg, MD
SN  - LCIRC 764
DO  - 10.6028/NBS.LCIRC.764
ER  -