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As for square taper bottom brackets, those have not been made in almost 15 years...Err no, square taper bb's are common, cheap, and widely available, and for those reasons remain the choice of cycle tourists.
You would have to search in the attic, inside the trunk, under the newspapers to even find a square taper bottom bracket and crankset.
Your Surly frame will have standard British/ISO threading on the bottom bracket. The threading is different on both sides. Here is what Park Tool says about the threading on your Surly frame.Mostly correct. Yes the Surly will definitely have an English threaded bottom bracket which installs as the Park Tool web site describes. However, there are a lot of non-"normal", non-English compatible bottom bracket and matching cranks out there these days. There are several competing and mutually incompatible press-fit designs that take 30 mm spindles and won't fit the more common 24 mm Shimano Hollowtech II cranks or older square taper cartridges.
"Most modern bikes use an ISO thread standard for the bottom bracket. The left side thread is a right-hand direction thread, which tightens clockwise and removes counter-clockwise. This standard is also called English or BSC. The right side (drive side) thread is a left-hand thread, which tightens counter-clockwise and remove clockwise."
Any normal mountain or road crankets and bottom brackets will work in the frame.