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PSCC

There are two carrier board versions.  The rectangular one is version 1.3 and the square one is version 1.5.  

For the directions for putting together the Pololu stepper controller carrier version 1.3 (PSCC v1.3, rectangular), check out this link.
For the directions for putting together the Pololu stepper controller carrier version 1.5 (PSCC v1.5, square), check out this link.