79WW_66-71
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Proceedings of the American Society of Civil Engineers 1971-02: <a href="https://archive.org/search.php?query=sim_pubid%3A833%20AND%20volume%3A97" rel="nofollow">Volume 97</a>, Issue WW1.<br />Digitized from <a href="https://archive.org/details/sim_raw_scan_IA1514513-01/page/n1784" rel="nofollow">IA