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Harry Kretz

About

Harry Kretz taught high school math for many years at Hawthorn Valley Waldorf School in Upstate New York. Since retiring from full-time work, he has worked more than full time traveling and teaching courses in various Waldorf schools and teacher training centers. 

Author's Books

Trigonometry

A Practical Introduction

Spiral bound
$12.95
Paperback
$7.95