A guide can be defined as a book that gives information about a topic or a subject. It is a document that provides information about a place or subject.
So, <u>a guide to all the national parks located within the United States is a book that gives information about the locations of the national parks in the U. S. Thus the medium of this guide will be in print. </u>
The guide will be provided in a print that will help the people to locate national parks in the U. S.