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"isbn:0773529497" sur books.google.com
" "In the words of the tunnellers themselves, and through previously unpublished photographs - many in colour - as well as contemporary plans and drawings, this book reveals how this most intense of battles was fought - and won.
"isbn:0773529497" sur books.google.com
Beneath Flanders Fields also shows how military mining evolved. The tunnellers constructed hundreds of deep dugouts that housed tens of thousands of troops.