'Traditional festivals of the Tay ethnic in Bac Son district, Lang Son province' by Hoang Tuan Cu is a collection, survey and introduction of some special traditional Tay festivals. The main content of the book consists of 2 parts, corresponding to two festivals: 1. The Long Rong festival (field breaking festival) in Quynh Son Commune: Temple and pagoda in Quynh Son; Worshiping rituals and the Long Rong festival; The matching process; Cuisine on the festival. 2. The Na Nhem festival (black painting of faces) in Tran Yen commune: Some of the legends of the Mo Van well, temple of Mo village, Sa Vun shrine; Preparations for the festival; The Na Nhem festival (the rituals, the fest, and matching ritual to carry King Cao Quyet to temple of Mo village.