No coin nor oath required. For personal study only.
Leonardo 1990: Volume 23, Issue SUPPLEMENT.
Digitized from IA1646609-06.
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Leonardo 1990: <a href="https://archive.org/search.php?query=sim_pubid%3A49130%20AND%20volume%3A23" rel="nofollow">Volume 23</a>, Issue 1.<br />Digitized from <a href="https://archive.org/details/sim_raw_scan_IA1652703-02/page/n232" rel="nofollow">IA1652703-02</a>.<br />Previous issue: <a href="http
Leonardo 1990: <a href="https://archive.org/search.php?query=sim_pubid%3A49130%20AND%20volume%3A23" rel="nofollow">Volume 23</a>, Issue 1.<br />Digitized from <a href="https://archive.org/details/sim_raw_scan_IA1646609-06/page/n651" rel="nofollow">IA1646609-06</a>.<br />Previous issue: <a href="http
Leonardo 1990: <a href="https://archive.org/search.php?query=sim_pubid%3A49130%20AND%20volume%3A23" rel="nofollow">Volume 23</a>, Issue 3.<br />Digitized from <a href="https://archive.org/details/sim_raw_scan_IA1652703-02/page/n264" rel="nofollow">IA1652703-02</a>.<br />Previous issue: <a href="http
Leonardo 1990: <a href="https://archive.org/search.php?query=sim_pubid%3A49130%20AND%20volume%3A23" rel="nofollow">Volume 23</a>, Issue 4.<br />Digitized from <a href="https://archive.org/details/sim_raw_scan_IA1652703-02/page/n276" rel="nofollow">IA1652703-02</a>.<br />Previous issue: <a href="http
Leonardo 1990: <a href="https://archive.org/search.php?query=sim_pubid%3A49130%20AND%20volume%3A23" rel="nofollow">Volume 23</a>, Issue 4.<br />Digitized from <a href="https://archive.org/details/sim_raw_scan_IA1646609-06/page/n746" rel="nofollow">IA1646609-06</a>.<br />Previous issue: <a href="http
Leonardo 1990: <a href="https://archive.org/search.php?query=sim_pubid%3A49130%20AND%20volume%3A23" rel="nofollow">Volume 23</a>, Issue 2.<br />Digitized from <a href="https://archive.org/details/sim_raw_scan_IA1652703-02/page/n247" rel="nofollow">IA1652703-02</a>.<br />Previous issue: <a href="http