TY  - GEN
AU  - Jespersen, James
AU  - Fitz-Randolph, Jane
AU  - Robb, John illus.
TI  - From Sundials to atomic clocks : understanding time and frequency
SN  - 048624265X
PY  - 1982///
CY  - New York
PB  - Dover Publications
KW  - TIME MEASUREMENT
KW  - CLOCKS
N1  - Index included
ER  -