Scope and Coverage
The ISTC has recorded 29,777 editions to date, although some of the records included in that number are actually 16th-century works that were included in previous incunable catalogs in error, so the number of true incunabula recorded is 27,460. The number of extant incunabula is estimated to be approximately 28,000 editions, which puts ISTC extraordinarily close to completing its goal of total coverage. Documenting these last few hundred editions is a tremendous undertaking, as the works are scattered in unknown locations in many countries, leaving bibliographers with no organized way to search for them except to "look everywhere".
While the ISTC is unsurpassed in coverage, it does not offer the same level of detail as the Gesamtkatalog der Wiegendrucke or the numerous collection catalogs that are available. Rather, the ISTC complements these resources by providing a searchable index of editions, referring to other catalogs and bibliographies for further detail. ISTC does not include information about individual copies of a work as standard, though a brief census of confirmed locations is provided, and may contain brief notes.
In general, the ISTC only covers extant editions, although records exist for some works that were sufficiently well-documented before being lost to fire or other calamities.
An illustrated edition of the ISTC was made available on CD-ROM in 1998. The addition of illustrations offers important information about a book's layout, format, and printing type. The images represent samples of each text rather than the full text.
Read more about this topic: Incunabula Short Title Catalogue
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