We are replacing a load-bearing wall to combine kitchen and dining room into one room. The span between the two is 11'3". Consulting several sources (including two pro contractor buddies), it appears that given the general structure of the whole operation, a 3" square steel beam an appropriate choice. My spouse, however, would like to check this against further sources. We have a copy of the state building code, which is less than useless, and I'm wondering if anyone can recommend a good book with this sort of info.