If you are unable to locate the resource you need through MeLCat, there are other catalogs you can use to order books and media.
Example searches:
Plague -- History (subject heading)
Epidemics -- Social Aspects (subject heading)
Plague -- Social Aspects (subject heading)
Influenza Epidemic (1918-1919) (subject)
Searching Tips
When you see a library item in your search results that looks like it might be useful, go ahead and click on it to see the record for the item. There you can look at its table of contents, its bibliographic information, AND, you can look at its Subject Headings.
Subject Headings are like "tags' that describe what the book/resource is about. You can use these "tags" as links to find other resources that have that same "tag."