Jim Bulmer writes:

To read the complete Wikipedia article, see:
Local exchange trading system(https://en.wikipedia.org/wiki/Local_exchange_trading_system)

To visit the Complimentary Currency Resource Center, see:
http://complementarycurrency.org/

To read the earlier E-Sylum articles, see:
MORE ON TIME BANKS AND TIME-BASED CURRENCIES(https://www.coinbooks.org/esylum_v15n38a22.html)
MODERN-DAY TIME BANKS (https://www.coinbooks.org/v22/esylum_v22n17a27.html)
NOTES FROM E-SYLUM READERS: MAY 26, 2019 : Query: Whitehorse, Yukon Local Currency(https://www.coinbooks.org/v22/esylum_v22n21a18.html)