The Ngram Viewer will let you compare using multiple words or names in one chart. The example that I give up this video is to compare the usage of the terms “National Parks,” “National Forests,” and “National Forest Service.” By looking at the Ngram Viewer for those terms I can see that they start to appear more regularly around 1890, have a lull in the 1940s and 1950s, and after that appear more often once again in the 1960s..
Ngram Viewer is based upon books indexed in Google Books. That is why below every graph created by Ngram Viewer you will find a list of books about each of your search terms. Those books are arranged by date..
A 3rd element of Ngram Viewer to keep in mind is that it works with several languages including English, French, Chinese, German, Italian, Russian, Hebrew, and Spanish..

By the method, the book that I discussed in the video is That Wild Country by Mark Kenyon..

Googles.
Ngram Viewer is a search tool that students can use to explore making use of words and names in books released between 1800 and 2019. The Ngram Viewer reveals users a chart showing the first appearance of a word or name in literature and the frequency with which that word or name appears in literature because 1800. The graph is based on the books and periodicals that are indexed in Google Books.

Ngram Viewer is a search tool that trainees can utilize to check out the use of words and names in books published between 1800 and 2019. The Ngram Viewer shows users a chart illustrating the very first look of a word or name in literature and the frequency with which that word or name appears in literature given that 1800. The Ngram Viewer will let you compare the use of several words or names in one graph.

Applications for Education.
As I discussed in the video above, the Ngram Viewer can supply a great way to start a research study activity for students. Have them enter a couple of words then take a look at the graph to determine peaks and valleys in the frequency of the words use. Then ask them to attempt to identify what would have triggered those words to be utilized more or less frequently at various periods in history.