Which Web Pages?

The web pages on our site which people most frequently use:

the Home Page (used three times more often than any other page)
New Mexico & Southwest Links
About Books & Literature
Southwest Reference Collection
Internet Starting Points
About the Library
New Mexico & Southwest Links (2nd half)
Library News
Gateway to Magazine Databases
Poetry and Poets of New Mexico
DVDs in the Library
Statistics and Demographic Information
Doing Local History in Santa Fe

       The big mystery is: how are users finding the Southwest Reference Collection page? The link is about three clicks down from anywhere you start, but people are finding it. From where?