Answer (1 of 10): Nearly all major printer software allow you to select the paper size, including A4. So in the US the only issue would be to get paper that size. I would be surprised if it isn’t available, considering the number of international organizations that have operations in the US. Chec
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HP Paper Printer, 8.5 x 11 Paper, Premium 32 lb, 1 Ream - 500 Sheets, 100 Bright, Made in USA - FSC Certified
What is the rationale behind standard paper sizes like A4 and A3
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