According the the About Us page its mission is to:
...develop a comprehensive research collection documenting American printed cartoon art, to organize the materials, and to provide access to these resources.
The scope of the collection includes:
- editorial cartoons
- comic strips
- comic books
- graphic novels
- sports cartoons
- magazine cartoons
There is a database to locate a certain artist or work:
You can search by creator, type of publication, type of market, the name of the cartoon or the format that the cartoon or graphic novel was published. Not all comics are represented but you do get to search for some of the early work in the topic.
You can view some of the collection online in galleries and albums:
This is a great example of a specialized library and a library/museum partnerships.