sixty-fourmo
A book size produced by folding a sheet with six
right angle folds, giving a leaf size 1/64 the
size of the sheet and forming a section of 128
pages. As it is both difficult and impractical to
fold a sheet with six right angle folds, the 64mo
is generally composed of a sheet folded with both
parallel and right angle folds, or by using more
than one sheet of paper and insetting. Written as
64mo or 64°.
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