Times Mirror Co. announced Friday that it had completed the acquisition of Wm. C. Brown Co., a publisher of college textbooks and related products.As previously reported, the transaction does not include Brown’s interests in Kendall/Hunt Publishing or its real estate development operations. Terms of the transaction were not disclosed. In a press release, Times Mirror said G. Franklin Lewis will continue to serve as president and chief executive of Brown. Times Mirror operates medical, scientific, technical and college publishing divisions in addition to its newspaper and cable TV operations. Last year, these divisions had revenues of more than $ 1 billion.