Kdo byl kdo is the name of two major encyclopedic

Encyclopedia

An encyclopedia is a type of reference work, a compendium holding a summary of information from either all branches of knowledge or a particular branch of knowledge....

 works in Czech

Czech language

Czech is a West Slavic language with about 12 million native speakers; it is the majority language in the Czech Republic and spoken by Czechs worldwide. The language was known as Bohemian in English until the late 19th century...

, published as books, CD-ROM

CD-ROM

A CD-ROM is a pre-pressed compact disc that contains data accessible to, but not writable by, a computer for data storage and music playback. The 1985 “Yellow Book” standard developed by Sony and Philips adapted the format to hold any form of binary data....

s and also available online. Their publisher is Libri:^{http://www.libri.cz/english.php}

• Kdo byl kdo v našich dějinách ve 20. století (Who was who in our history in 20th century): ISBN 80-85983-44-3 volume 1, 467 pages, ISBN 80-85983-64-8 volume 2, 482 pages, printed, CR-ROM, online.
• Milan Churaň et al.: Kdo byl kdo v našich dějinách do roku 1918 (Who was who in our history until 1918): ISBN 80-85983-94-X, 572 pages, printed, CD-ROM, and online.

Among other books in the "Kdo byl kdo" edition are

• Kdo byl kdo - proslulí návštěvníci (Who was who - Famous visitors): ISBN 80-85983-87-7, 516 pages.
• Kdo byl kdo - slavní vojevůdci (Who was who - Famous commanders): ISBN 80-85983-19-2, 333 pages.
• Kdo byl kdo v našich dějinách - komplet: complete edition in three volumes, ISBN 80-85983-65-6.
• A database providing the biographical data sorted by date (Kalendárium) available online.

The encyclopedia covering the period until 1918 contains biographies of about 800 people notable in the history of Czech

Czech lands

Czech lands is an auxiliary term used mainly to describe the combination of Bohemia, Moravia and Czech Silesia. Today, those three historic provinces compose the Czech Republic. The Czech lands had been settled by the Celts , then later by various Germanic tribes until the beginning of 7th...

 and Slovak

Slovakia

The Slovak Republic is a landlocked state in Central Europe. It has a population of over five million and an area of about . Slovakia is bordered by the Czech Republic and Austria to the west, Poland to the north, Ukraine to the east and Hungary to the south...

lands. Short information is provided about another 1,000 people. The encyclopedia for the 20th century contains biographies of over 1,200 people and short information about 2,000 others.

The main target market of the works is schools.