An architect's perspective on repointing by Sean Johnson
B.A. Dip. Arch. Oxford, MSc (Arch)(Cons) (2000)
An academic paper on how to extend the life of masonry through choice of mortar and aggregate type:
Mortar mechanics by a senior building consultant (2007): http://www.buildingconservation.com/articles/pointing/lime-pointing.htm
This is perhaps the best county council advice I have seen to date:
Society for the Protection of Ancient Buildings
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