Detective and mystery stories, Vietnamese Vietnamese fiction Vietnamese detective and mystery stories Vũ, Thanh Sơn. Điệp viên mang bí só̂ T31, 2000: t.p. (Điệp viên mang bí só̂ T31) Eng. summary (detective and mystery story; about a spy with the code name T31) http://www.oclc.org/research/researchworks/terms.htm sh2005004703 DLC 050720 20121002161250.7 sh2005004703 eng