Fundamentals and Applications of Small Molecule X-ray Crystallography
Some useful links:
https://symmetry.otterbein.edu/tutorial/index.html
https://symmetry.jacobs-university.de/
https://www.ruppweb.org/Xray/101index.html
https://history.amercrystalassn.org/jim-ibers
Free Crystallographic Software:
SHELX: https://shelx.uni-ac.gwdg.de/SHELX/
OLEX2: https://www.olexsys.org/
PLATON: https://www.cryst.chem.uu.nl/spek/platon/pl000000.html
FullProf: https://www.ill.eu/sites/fullprof/
Encifer: https://www.ccdc.cam.ac.uk/Community/csd-community/encifer/