Page Comparison

Protein crystallography (general)
Good article for basics of PX

Article:
Protein Crystallography for Non-Crystallographers
10.1111/j.1742-4658.2007.06178.x

MX1 paper

https://doi.org/10.1107/S1600577514021717

MX2 paper

https://doi.org/10.1107/S1600577518003120

Metal edges and X-ray absorption

http://skuld.bmsc.washington.edu/scatter/AS_periodic.html

Space groups (diagrams)

http://img.chem.ucl.ac.uk/sgp/large/sgp.htm

Space groups (list)

http://merkel.texture.rocks/Various/spacegroup.php?lang=en

CCP4 online - BALBES pipeline is good for MR

http://www.ccp4.ac.uk/ccp4online

PyMol wiki - make your figures look nice

https://pymolwiki.org/index.php/Main_Page

Protein crystallography (general)
Everything on this Princeton site is useful

http://xray0.princeton.edu/~phil/Facility/x101/x101.html

Crystal growth
The Hampton pages are helpful and hilarious

https://hamptonresearch.com/crystal-growth101.php

Phenix Phaser Tutorial

https://www.phenix-online.org/documentation/tutorials/mr.html

Heavy atom phasing
Very useful table showing best combinations of buffers/pHs and heavy atoms for derivatization

Article:
A rapid and rational approach to generating isomorphous heavy‐atom phasing derivatives
https://doi.org/10.1111/febs.12910