D 6026 - 21
๐ Scientific
No coin nor oath required. For personal study only.
๐ SIMILAR VOLUMES
The Engineer December 21-28, 1972: <a href="https://archive.org/search.php?query=sim_pubid%3A1202%20AND%20volume%3A235" rel="nofollow">Volume 235</a>, Issue 6093-6094.<br />Digitized from <a href="https://archive.org/details/sim_raw_scan_IA1518514-07/page/n408" rel="nofollow">IA1518514-07</a>.<br />