A collection of current travel guides for U.S. and international locations is located in the Travel Collection on the first floor of the MSU Main Library (next to the Browsing Collection).
A small collection of current travel guides is available in ebook format.
Older or more specialized guides and other online guidebooks can be found using the MSU Libraries catalog.
Sample search: guidebooks and Portugal (or desired country)
For online guidebooks, use the above search and limit results to "Electronic Resources".