Are the International Tables for Crystallography available?
On-line Space Group diagrams are available at http://smb.slac.stanford.edu/facilities/software/spacegroups/. This site is for local access only; the NX Client can be used to view the tables remotely. The full International Tables are available at http://it.iucr.org/. The IUCr site is fully accessible from SSRL or the NX client (or off-site if your local institution has a license).