Thermal Cross Sections

[virgileso]

Where can I get reliable information on the cross section of various substances: boric acid, O2, Uranium, water, etc?

[Bob S]

I think this is a re-issue of the famous BNL Barn Book (an 11" by 17" book with a barn on the cover), that had plots of the thermal cross sections of all elements and isotopes:
http://www.nndc.bnl.gov/atlas/
Bob S