Amarillo Design Bureau have added a PDF version of the Federation & Empire 2010 rulebook to the E23 website. From their website:
This is the updated 160-page rulebook for the core game, released during 2010. It has been fully updated with all published rulings, and includes a few rules from various expansions which we decided needed to be in the main game box. (This does not include the expansion rulebooks.) This high-resolutionPDF is fully searchable, making it easy to find any rule.