From the Maitland Mercury report:
Minutes before 2am on December 19, 1980, Maitland Woolworths was bombed.
Located in High Street at the time, next to the Westpac Bank, the blast caused $300,000 of stock damage.
A bomb had been lowered through a vent near the back car park of the variety shop.
Police were aware that Woolworths at Warilla had also been bombed with gelignite using a timer attached, and it too had been lowered through the roof.
Three days after the Maitland bombing, Woolworths in George Street, Sydney received a call and a letter addressed to then company executive Mr AJ Harding with a list of demands.
Full article available at Maitland Mercury, Dec. 18, 2014.