TY  - RPRT
TI  - Distribution of outgoing first class lettermail at the Washington, D.C. Post Office 
AU  - Newman, Arthur E
PY  - 1959
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS RPT 6365
DO  - 10.6028/NBS.RPT.6365
ER  -