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books%3Fid=fZCJUI0UMDUC&pg=PA68&lpg=PA68&dq=al+helfer&source=web&ots=-aFMOoNQQL&sig=CAYFPHZX5revbd8EBvO-yUTfAt8%23PPA69,M1
books%3Fid=fZCJUI0UMDUC&pg=PA68&lpg=PA68&dq=al+helfer&source=web&ots=-aFMOoNQQL&sig=CAYFPHZX5revbd8EBvO-yUTfAt8%23PPA69,M1
https://books.google.com/books%3Fid=fZCJUI0UMDUC&pg=PA68&lpg=PA68&dq=al+helfer&source=web&ots=-aFMOoNQQL&sig=CAYFPHZX5revbd8EBvO-yUTfAt8%23PPA69,M1
Al Helfer
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books%3Fid=fZCJUI0UMDUC&pg=PA68&lpg=PA68&dq=al+helfer&source=web&ots=-aFMOoNQQL&sig=CAYFPHZX5revbd8EBvO-yUTfAt8%23PPA69,M1
https://books.google.com/books%3Fid=fZCJUI0UMDUC&pg=PA68&lpg=PA68&dq=al+helfer&source=web&ots=-aFMOoNQQL&sig=CAYFPHZX5revbd8EBvO-yUTfAt8%23PPA69,M1