[dinosaur] Jensen's giant Dry Mesa sauropods in Reader's Digest

[Mike Taylor <mike@indexdata.com>]

Folks,

I always thought Jim Jensen's three (or two, or one) giant sauropods
from the Dry Mesa quarry -- Supersaurus, Ultrasaurus and Dystylosaurus
-- were first informally named in Reader's Digest. And the Dutch
Wikipedia entry seems to confirm this, saying it was in 1973:
        
https://urldefense.proofpoint.com/v2/url?u=https-3A__nl.wikipedia.org_wiki_Supersaurus&d=DQIBaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=lblI_fK4rgD9_ccY4cq4P2Kc75VHstjvgGqywQlvmOM&s=WuXFHKW3BiArGy_zGN7Xiga6tbZq7FRi83V774zI_e8&e=
 

But the set of issue covers from 1973 at
        
https://urldefense.proofpoint.com/v2/url?u=http-3A__backissues.com_Manufacturer.do-3Fcode-3DReaders-2DDigest-2DMagazine-26type-3D6-26firstRow-3D1-26noMiddleLinks-3D1-26sortBy-3DcodeAsc-26submittedByUser-3Dtrue-26dateRangeFrom-3D1973-26dateRangeTo-3D1973&d=DQIBaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=lblI_fK4rgD9_ccY4cq4P2Kc75VHstjvgGqywQlvmOM&s=JHWaHdA8pF62Tm3vtZbpKyKQNUgpng_xV3OSLYhT-hc&e=
 
doesn't show any article title that looks right.

Does anyone know what the full reference is? Better still, does anyone
have a copy of the article?

Thanks!