Anchors to mount shelves on a plaster wall
I want to hang a couple of shelves on a plaster chimney wall in my renovated 1893 city house. The wall is clean and in good repair, but I don't know what's behind the plaster. I suspect it's likely to be brick.
The shelves are simple 24-inch by 8-inch by 1-1/2-inch slabs (hollow, I think) from West Elm, not very heavy, with three keyholes along the back edge to slip over screw heads. I need them for some small books (a pocket dictionary, my calendar book, a couple of similar small reference and journal books) and some desk tools (stapler, tape, paper clip cup, and the like).
How should I proceed?