Manner by which the sheets are printed on both sides. From Henri Bouchot 'The Printed Book' (1887), page 244, published size in Bouchot 8.5cm wide by 6.7 cm high.

Manner by which the sheets are printed on both sides. From Henri Bouchot 'The Printed Book' (1887), page 244, published size in Bouchot 8.5cm wide by 6.7 cm high."