TY  - RPRT
TI  - Tables relating to degradation of information: semi-annual progress report July 1 to December 31, 1956, part I
PY  - 1957
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS RPT 5162
DO  - 10.6028/NBS.RPT.5162
ER  -