Link			Contents	Description
Link	Foster, Tom	1970s	The Modern ‘Unpaid’ and ‘Tax’ Markings	Unpublished draft, finalised by Reg Lant
Link	Lant, Reg	1981	Underpaid & Tax Markings	Comprehensive listing of marks known at the time (from BCPSG Journal)
Link	Swarbrick, Bob	1986	Jamaica Modern 'To Pay' Handstamps	Follow up to Lant with emphasis on 'Rubber Denomination' handstamps (aka Woodblocks)
Link	Jarvis, Steve	2009	Underpaid & Tax Markings	Draft documents for an update on this topic