TY  - RPRT
TI  - Letter Circular 617: measurement of the reflectance of manila rope fiber (supersedes Letter Circular 393)
PY  - 1940
PB  - National Institute of Standards and Technology
CY  - Gaithersburg, MD
SN  - LCIRC 617
DO  - 10.6028/NBS.LCIRC.617
ER  -