Херман Холерит — разлика између измена
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* -{[http://www.officemuseum.com/data_processing_machines.htm Early Office Museum: Punched Card Tabulating Machines]}-
* {{MacTutor Biography|id=Hollerith}}
* -{[https://web.archive.org/web/20130806043348/http://www.rhd.uit.no/census/ft1900e.html The Norwegian Historical Data Center: Census 1900] Includes a description of the use of Hollerith machines ("complicated, American enumeration machines"), together with illustrations.}-
* -{The [http://findingaids.hagley.org/xtf/view?docId=ead/2353.xml Research notes on Herman Hollerith] collection at [[Hagley Museum and Library]] includes the research materials Geoffrey Austrian used to write ''Herman Hollerith: Forgotten Giant of Information Processing''.}-
* -{[http://findingaids.hagley.org/xtf/view?docId=ead/2054.xml Richard Hollerith Papers] at [[Hagley Museum and Library]]. Richard Hollerith was the grandson of Herman Hollerith and part of this collection documents the sale and settlement of the Herman Hollerith estate following the death of his last remaining child, Virginia.}-
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