Use the subject search ("personal narratives" OR diaries) combined with the subject or individual you're studying. Limit to books and ebook
You can try a similar approach by putting Diar* as a title keyword.
Important note: do not limit the publication date range. Even if the diaries was originally published in the 19th century, it will be listed under the reprint year; limiting the publication date will cause you to miss published volumes.
Overall, you best bet is to use worldcat.
Some highlights