D 6321 - D 6321M - 22
๐ Scientific
No coin nor oath required. For personal study only.
๐ SIMILAR VOLUMES
The Engineer December 15-22, 1977: <a href="https://archive.org/search.php?query=sim_pubid%3A1202%20AND%20volume%3A245" rel="nofollow">Volume 245</a>, Issue 6351-6352.<br />Digitized from <a href="https://archive.org/details/sim_raw_scan_IA1518515-05/page/n382" rel="nofollow">IA1518515-05</a>.<br />