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WikiPedia: Lũy thép Vĩnh Linh //www.worldcat.org/oclc/19734987 //www.worldcat.org/oclc/45066105 //www.worldcat.org/oclc/53129383 //www.worldcat.org/oclc/605401589 //www.worldcat.org/oclc/6528409 //www.worldcat.org/oclc/945195142 https://www.bienphong.com.vn/ben-do-tung-luat-bieu... https://cand.com.vn/Tu-lieu-van-hoa/Hoang-Van-i581... https://books.google.com.vn/books?id=8oILAQAAMAAJ https://books.google.com.vn/books?id=CYg3AAAAIAAJ