The databases listed in the Book Reviews section also cover general news sources and newspapers. The dates of coverage may vary by the publication. Materials were just beginning to go online in the 1990s and not all have digitized older issues. Often we have print copies of older issues. The FindIt@MU links in the databases should guide you to the print as well as to online full text.
Note that not all newspapers are available online and not all are well indexed. To find book reviews, or news of (then) current events, you may want to browse papers around the relevant date. We have many newspapers on microfilm in Special Collections.
Book reviews may not be as analytical or scholarly as criticism, but reflect more immediate reaction to a book upon publication. In the databases look for an option to limit your search to book reviews, often under "publication type". There are also indexes that list only book reviews. Remember that the "author" in the search is likely the author of the REVIEW; search the author of the book as a subject or keyword.