‘On the manufacture of gun-flints, the methods of excavating for flint, the age of Palæolithic man, and the connexion between Neolithic art and the gun-flint trade’, by SBJ Skertchly, 1879 – downloadable from https://archive.org/details/onmanufactureofg00skerrich/
'From Brandon to Bungay’ and ‘Evolution of a Breckland Landscape’ by RG West (Suffolk Naturalists Society; 2009 & 2015) - buy both from http://www.sns.org.uk/pages/books.shtml