Added PoundPerSquareFoot and PoundPerThousandSquareFeet #1638
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Standard for paper grammage/base weight in North America is lbs/MSF (pound per 1000 square feet) instead of g/m².
Conversion factor is standardized by TAPPI (free sample of TIP 0800-01 can be found here).
I also added lbs/ft² for completeness.