6230
๐ Scientific
No coin nor oath required. For personal study only.
๐ SIMILAR VOLUMES
The Engineer August 28-September 04, 1975: <a href="https://archive.org/search.php?query=sim_pubid%3A1202%20AND%20volume%3A241" rel="nofollow">Volume 241</a>, Issue 6233-6234.<br />Digitized from <a href="https://archive.org/details/sim_raw_scan_IA1518514-07/page/n1510" rel="nofollow">IA1518514-07</