Out of his first 200 articles, Charlie wrote 66 articles that relate to the Study of Humor. Volume 1 is that collection of articles. It is a large .pdf file with bookmarks that can be read to help you understand using humor to illustrate your messages using humor.
These are lite reads, only a few pages each, that cover many different subjects. They help to illuminate his approach to the study of humor and elaborate on points he makes in his talks and workshops. They are not academic, rather he tells stories to readers that may shed light on subjects he felt important. You'll read the written versions of many of his jokes and get an insight on how he thinks when it comes to using humor.
These articles are an excellent supplement to your study of humor. Volume 2 focuses more on the business of humorous speaking, types of humor and his talks.