TY  - RPRT
TI  - From sundials to atomic clocks : understanding time and fluency
AU  - Jespersen, James
AU  - Fitz-Randolph, Jane
PY  - 1999
PB  - National Institute of Standards and Technology
CY  - Gaithersburg, MD
SN  - NBS MONO 155e1999
DO  - 10.6028/NBS.MONO.155e1999
ER  -