If you are doing a research project on drum kits, there are several things to do.
First, you can start with wikipedia and get a general sense. After this, if you look at the bottom of the wikipedia entry, there are a list of sources that the author has used to create the article. Many of these sources have hyper-links. All you need to do is to click on these and you can begin to read the sources. This should be more than enough.
Second, when you do a search on google or another search engine, you can use key words. So, how about "drums" and "history", as key words? How about "drums" and "culture"? These combinations should yield interesting results.