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The Abacus: The World's First Computing System The Abacus: The World's First Computing System
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JoAnn Brown
JoAnn Brown is on page 51 of 143
Appears to be written for an elementary school age audience.
— Jul 01, 2025 07:39PM Add a comment
The Abacus: The World's First Computing System


Kyle
Kyle is on page 73 of 143
— Dec 31, 2022 11:22AM Add a comment
The Abacus: The World's First Computing System

Brett
Brett is on page 120 of 143
— May 28, 2021 12:20PM Add a comment
The Abacus: The World's First Computing System

Brett
Brett is on page 89 of 143
— May 27, 2021 05:34PM Add a comment
The Abacus: The World's First Computing System

Brett
Brett is on page 72 of 143
— May 27, 2021 04:08PM Add a comment
The Abacus: The World's First Computing System

Brett
Brett is on page 51 of 143
— May 26, 2021 12:13PM Add a comment
The Abacus: The World's First Computing System

Fermibot
Fermibot is on page 88 of 143
— Oct 01, 2019 06:35PM Add a comment
The Abacus: The World's First Computing System

Fermibot
Fermibot is on page 88 of 143
— Oct 01, 2019 06:12PM Add a comment
The Abacus: The World's First Computing System

Fermibot
Fermibot is on page 72 of 143
— Sep 30, 2019 07:55PM Add a comment
The Abacus: The World's First Computing System

Fermibot
Fermibot is on page 53 of 143
— Sep 29, 2019 08:39PM Add a comment
The Abacus: The World's First Computing System

Fermibot
Fermibot is on page 32 of 143
Good intro on the base systems
— Sep 10, 2019 03:46PM Add a comment
The Abacus: The World's First Computing System






Dan
Dan is on page 131 of 143
— Mar 16, 2013 11:09AM Add a comment
The Abacus: The World's First Computing System

Dan
Dan is on page 89 of 143
— Mar 14, 2013 11:28AM Add a comment
The Abacus: The World's First Computing System

Dan
Dan is on page 56 of 143
— Mar 11, 2013 01:11PM Add a comment
The Abacus: The World's First Computing System

DSB
DSB is on page 60 of 143
— Nov 29, 2012 08:08PM Add a comment
The Abacus: The World's First Computing System