6.
QA-2, (Natural Arithmetic) : Natural Arithmetic
by Iverson, Ben
ISBN: 9781883401078
List Price: $15.00
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QA-1, (Natural Arithmetic) : The Ancient Mathematics
by Iverson, Ben, Pond, Dale
ISBN: 9781883401061
List Price: $15.00
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Pythagoras and the Quantum World
by Iverson, Ben, Elkin, Carl
ISBN: 9781883401030
List Price: $25.00