http://www.au.af.mil/au/awc/awcgate/cst/bugs_ch12.pdfIs only 28 pages and presents a good summary as well. Also explains that EMP is not lightning.
EMP contains E1, E2 and E3 pulses. E2 is most lightning-like.
E1 is what will fry circuits - even in your steel house.
No tinfoil involved. Very serious potential threat.