Jules Benjamin in A Student's Guide to History (2001) defines historiography as the "study of changes in the methods, interpretations, and conclusions of historians over time."
The word historiography is a subject term in the library catalogue. Combine the term historiography with a keyword on a topic in the search box on the main page of the library website. Start with a broad topic and then read what's been written on the subject to help you narrow your topic. For example:
Blackwell Companions to History give an overview of the scholarship and in some cases the controversies on a particular topic, time period or geographical locations. Search the library catalogue for blackwell companion in combination with a keyword on a topic. For example:
Combine your search terms with the term AND to effectively search for historiographies in Historical Abstracts, America History and Life, JSTOR and other journal article databases. For example, in the top search box in Historical Abstracts type:
Vietnam war and historiography