TY  - BOOK
AU  - Mortensen,Otto
TI  - Jens Olsen's clock: a technical description 
PY  - 1957///
CY  - Copenhagen
PB  - Technological Institute
KW  - Olsen, Jens,
KW  - Astronomical clocks
KW  - fast
KW  - Clock (general)
KW  - Technological Institute
KW  - Mortensen, Otto
KW  - monumental specific astro
KW  - Denmark Copenhagen Jens Olsen
ER  -