A database of chemical/physical properties is included in the I.S.A.A.C.S. program, this appendix presents these properties (atomic radii, x-ray and neutron scattering lengths) as well as the references of the articles from which this information was obtained.
Note that the data presented in this appendix is available for download on the web sites of the program:
http://isaacs.sourceforge.net/phys/chem.html
http://people.cst.cmich.edu/petko1vg/isaacs/phys/chem.html