Laurence Sigler

Here Begins the Fourth Chapter on the Subtraction of Lesser Numbers from Greater Numbers

Laurence Sigler, 2002 .

Here Begins Chapter Eight on Finding The Value of Merchandise by the Principal Method

Laurence Sigler, 2002 .

Here Begins the Third Chapter on the Addition of Whole Numbers

Laurence Sigler, 2002 .

Fibonacci's Liber abaci

Laurence Sigler, L. Sigler, 2002 .