The Baker's catalogue you mentioned sounds like the one from King Arthur
flour company. They really are a great company, very supportive of home
baker's and good quality artisanal bread. They make what is easily the
best bread flour available for home baking. In the past few years they
have really expanded in grocery stores and you can probably find them in a
chain near you. Their regular flour is higher in gluten than other
company's bread flour. And their "Special for Machines" flour is 12.7%
gluten, thus they recommend you use it in machines (mixers or bread
machines) in order to properly develop the gluten. All of their flour is
made from hard wheat varieties and is thus superior to that offered by
other companies if you're using the flour for bread.
I buy quite a few things from their catalogue. They are pricey, but they
offer things you can't easily find elsewhere.