Lets put this in reverse. We may find it through specialist newsletters, active nexus points, or through mailing lists. This discussion continues in Section 32 of the Information Research FAQ . When an artist begins to paint, they visualize the image. They already have a concept of the finished result.
Internet research is no different.
We start by building a vision of the information we seek. Who would publish it. What is their motivation. Who would promote it. Where would I find it.