ARGH! When I tried to explain during your class how to find online primary sources through SearchPlus, I was completely wrong. The method below is what I was grasping for.
This section identifies all the individual databases we subscribe to. Most of these databases (but not all) are being searched collectively when you use SearchPlus.
On the left, click on the Primary Sources tab. On the right is a short list of the most frequently used online collections of primary sources. Or go to the entire giant list at the bottom.