"hkcd" also publishes various kinds of books, while most are in chinese, including ""the last episode of ten colonels""《十大元帥大結局》、""the mystery of xiaoshan""《韶山之謎》、""the last 28 days of cultural revolution""《文革最后的28天》、""horror and anti-horror""《恐怖與反恐怖》、""human and ghost""《人鬼神》、""force of china""《中國力量》. many are on current political and economic issues. for its 30th anniversary in 1982 it published a book called "knowledge of living" with useful information on health care, electrical appliances and useful telephone numbers in hong kong and guangzhou etc.. some feature stories and articles in the newspaper are later collected and published as books.