I've got the "timber frame joinery and design workbook" and have found that it doesn't have everything I need to do the engineering.

What else do I need. The book "timber framing fundementals" from looking at the contents seems to duplicate a lot of the info in the workbook. Is there enough extra info to justify buying it as well as the masters book and the second work book?

http://tfguild.stores.yahoo.net/tifrfu.html
http://tfguild.stores.yahoo.net/magutotifr.html
http://tfguild.stores.yahoo.net/workbooks-1-amp-2-together-sa12.html