Two questions concerning white oak strength properties:

1) THe values in table 4D of the NDS are much less than those given in the timberframe red book and also Chappell's "A Timberframer's Workshop". Why is this and is one more reliable than the other? I would normally take the conservative route and use the smaller values, but is there any indication that the larger ones are valid?

2) The compressive strength perpendicular to grain is larger than that parallel to grain according to the NDS. This is not a type is it?