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Helical Piles : A Practical Guide to Design and Installation by Howard A. Perko
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Helical Pile : A Practical Guide to Design and Installation, Hardcover by Per...
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Helical Piles: A Practical Guide to Design and Installation by Howard A. Perko (
Helical Piles: A Practical Guide to Design and Installation by Howard A. Perko (
HELICAL PILES: A PRACTICAL GUIDE TO DESIGN AND INSTALLATION BY Howard A. Perko