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http://doc.qt.io/qt-4.8/qprinter.html
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QPrinter::A0	5	841 x 1189 mm
QPrinter::A1	6	594 x 841 mm
QPrinter::A2	7	420 x 594 mm
QPrinter::A3	8	297 x 420 mm
QPrinter::A4	0	210 x 297 mm, 8.26 x 11.69 inches
QPrinter::A5	9	148 x 210 mm
QPrinter::A6	10	105 x 148 mm
QPrinter::A7	11	74 x 105 mm
QPrinter::A8	12	52 x 74 mm
QPrinter::A9	13	37 x 52 mm
QPrinter::B0	14	1000 x 1414 mm
QPrinter::B1	15	707 x 1000 mm
QPrinter::B2	17	500 x 707 mm
QPrinter::B3	18	353 x 500 mm
QPrinter::B4	19	250 x 353 mm
QPrinter::B5	1	176 x 250 mm, 6.93 x 9.84 inches
QPrinter::B6	20	125 x 176 mm
QPrinter::B7	21	88 x 125 mm
QPrinter::B8	22	62 x 88 mm
QPrinter::B9	23	33 x 62 mm
QPrinter::B10	16	31 x 44 mm
QPrinter::C5E	24	163 x 229 mm
QPrinter::Comm10E	25	105 x 241 mm, U.S. Common 10 Envelope
QPrinter::DLE	26	110 x 220 mm
QPrinter::Executive	4	7.5 x 10 inches, 190.5 x 254 mm
QPrinter::Folio	27	210 x 330 mm
QPrinter::Ledger	28	431.8 x 279.4 mm
QPrinter::Legal	3	8.5 x 14 inches, 215.9 x 355.6 mm
QPrinter::Letter	2	8.5 x 11 inches, 215.9 x 279.4 mm
QPrinter::Tabloid	29	279.4 x 431.8 mm
QPrinter::Custom	30	Unknown, or a user defined size.