Reddit mentions of Timber Frame Construction: All About Post-and-Beam Building

Timber framing is not the same as 2x4 construction, but a timber frame may use 2x4's to fill in the gaps. The main difference between a timber frame and "stick-built" (2x4) structure is that the timbers are the main source of structure or "skeleton" of the building. Once the frame is built, you just have to fill in the empty spaces. You can do this with dimensional lumber like 2x4's, or you can do cordwood, which is cement and logs (looks amazing). There are a number of other option for filling in a timber frame that your book probably covers. Timber-framing is a bit more involved and physically demanding than 2x4/stick built framing, but it is also much more beautiful and will last much longer. I've timber-framed a few small cabins and I can tell you first hand that it is an incredibly fun and satisfying way to build.

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Edit: this is also a great resource https://www.amazon.com/Timber-Frame-Construction-Post-Beam/dp/0882663658/ref=sr_1_3?keywords=timber+frame&qid=1563287101&s=gateway&sr=8-3

This is an old book by Jack Sobon. He is a timber-framer and has become a historian on old barns.

"Silent Spaces" is a beautiful book of old barns of Europe.

http://www.amazon.ca/Timber-Frame-Construction-Post-Beam/dp/0882663658

for this type of building that is a great primer