No coin nor oath required. For personal study only.
Scientific American 2012-10: Volume 307, Issue 4.
Digitized from IA1627717-03.
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Scientific American 2010-10: <a href="https://archive.org/search.php?query=sim_pubid%3A142%20AND%20volume%3A303" rel="nofollow">Volume 303</a>, Issue 4.<br />Digitized from <a href="https://archive.org/details/sim_raw_scan_IA1627717-01/page/n2617" rel="nofollow">IA1627717-01</a>.<br />Previous issue
Scientific American 2011-10: <a href="https://archive.org/search.php?query=sim_pubid%3A142%20AND%20volume%3A305" rel="nofollow">Volume 305</a>, Issue 4.<br />Digitized from <a href="https://archive.org/details/sim_raw_scan_IA1627717-03/page/n107" rel="nofollow">IA1627717-03</a>.<br />Previous issue:
Scientific American 2013-10: <a href="https://archive.org/search.php?query=sim_pubid%3A142%20AND%20volume%3A309" rel="nofollow">Volume 309</a>, Issue 4.<br />Digitized from <a href="https://archive.org/details/sim_raw_scan_IA1627717-03/page/n383" rel="nofollow">IA1627717-03</a>.<br />Previous issue:
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