fascicle
Sections of a work which, for various reasons,
including the economics of publishing and the
convenience of printing, are issued in
installments. They are frequently incomplete in
themselves and do not necessarily coincide with
the formal divisions of the publication. They
usually consist of sections, or groups of plates,
protected by temporary (sometimes printed)
wrappers, and may or may not be numbered or
designated as part, fascicle, etc. They present
binding problems, particularly in that they do not
necessarily coincide with the divisions of the
work, and they must either be bound as odd units
or held until publication or printing has been
completed. Publication in parts, or fascicles,
began in England in the early 17th century, become
common in the 18th century, and has become
relatively also: PARTS
OF A BOOK .