I checked my local library's catalogue for information regarding the Glencoe Massacre.
Zip. NOTHING. Not as a title, keyword, or subject. Most of what I got back from my search was a bunch of historical novels (none of which were the one that I know was written about this event (Lady of the Glen by Jennifer Roberson) and a listing of Outlander DVDs. Outlander is 50 years too late for my purposes, and I'm not touching Culloden in my story. It was already addressed in Highlander and I'm trying to stay away from specific places and events that were presented on that show.
So... eBay.