TY  - BOOK
AU  - Berg,R.van den
TI  - Kwarts ABC
T2  - Spiegelwerk
PY  - 1982///]
CY  - 's-Gravenhage
PB  - Federatie Goud en Zilver
KW  - Oscillators, Crystal
KW  - Precious stones
KW  - Wrist watches
KW  - Electrical Science
KW  - Netherlands
KW  - Electronic
KW  - Wrist Watch
ER  -