In the 3D viwport, in edit mode, choose wireframe option and face select mode. Now the median point of the vertices of each face will be visible as a black sqare. Select one face, and switch to vertex select mode. Now the face you selected will still be selected, but you will also see the vertices which define it's bounds. Press the H key to hide those vertices, and the face to selected and all faces containing any of the vertices of the edge its face will be hidden. If you then switch back to face select mode, you will see the selection points for the overlapping faces and delete them in the usual manner. If there are more overlapping faces, repeat the process of selecting the center of the face in face select mode, switching to vertex select mode, hiding the vertices of the face and selecting and deleting the faces you want to eliminate.
When you have completed the deletion(s), unhide the hidden vertices using the key combination ALTH.
NOTE: sometimes I find it useful or necessary to toggle between wireframe and solid shading in the viewport when hiding vertices.
ALSO NOTE: Sometimes it's not easy because it's tedious and time consuming.