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Quartz Crystals

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History

HARNESSING NATURE’S TIMEKEEPER: A HISTORY OF THE PIEZOELECTRIC QUARTZ CRYSTAL TECHNOLOGICAL COMMUNITY (1880­1959)

Stack Exchange

Quartz oscillator using a large irregular (natural) piece of quartz crystal for maximum Q?

How to cut, polish, mount, tune quartz resonators

Crystal Control for Amateur Transmitters —1925 (PDF)