A keyword search allows you to search for a word, words or a phrase anywhere in the library catalogue record (such as author name or words appearing in the title).
alternative media and canada
alternative and press and canada
(alternative or independent or underground or activit or radical) and (media or press)
Subject searches use Library of Congress SUBJECT HEADINGS. These are standardized headings assigned to a book to describe what the book is about. A single book may have one or, more likely, several different Subject Headings.
Examples of Subject Headings that may be helpful when searching for books on topics related to mass media and alternative media include:
Alternative mass media
Alternative mass media--Canada
Communication in social action
Freedom of the press--United States
Mass media criticism
Mass media--Political aspects
Mass media and propaganda
Underground press publications--United States--History--20th century
As the above examples help to illustrate, subject headings are not always intuitive. Beginning with a Keyword search can often help identify relevant subject headings that can then be used to identify additional books on a topic.
Once you have found one or more books of interest to you, take a look at the Subject Headings for those books in the Library Catalogue record. You can then click on those headings that seem appropriate to find additional titles similar to the one(s) you've already found.