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Paper size - Wikipedia
A-series paper formats size, A0 A1 A2 A3 A4 A5 A6 A7 with labels and dimensions in milimeters. International standard ISO paper size proportions the actual real millimeter size Stock Vector Image
1Pc Matte Transparant A4/B5/A5/A6/A7 Losbladige Notebook Case Ringband notebook Shell Bestand Cover Map Office School Supply|null| - AliExpress