Stacked module/rig effectiveness (if penalized)
1st module = 100.000%
2nd module = 86.9119842%
3rd module = 57.1037996%
4th module = 28.2469117%
5th module = 10.5988834%
6th module = 2.9989473%

Mining Links:

Updated Prices: http://ore.cerlestes.de/index.html

Circle Grid: https://wiki.eveonline.com/wikiEN/images/e/e0/Ore_grid%28dark%29.png

Retriver Fits: http://wiki.eveuniversity.org/Retriever

General:

Mission Reports: http://www.evesurvival.caedwards.net/wikka.php-wakka=MissionReports.htm

Station Search: http://eve-online.itemdrop.net/eve_db/universe/station_search/

Player Services:

Jump Clones: https://forums.eveonline.com/default.aspx?g=posts&m=41972&#post41972