Over at Ravelry, in the Pattern page for the Hooded Ribbed Jacket seen in that 1973 McCalls booklet, I posted my 2 cents in the comments section:
"It’s a crying shame that McCall’s has allowed this design to become lost, and unavailable to 21st Century knitters. With copyright laws that can lock up the design for 95 years from the publishing date, and maybe longer if McCall’s extends the copyright…it makes the design totally unavailable to 21st Century knitters. There are a few vintage copies of the Leaflet/booklet found on Ebay auction/bid basis only, but this hardly qualifies as a viable resource."
I may write to McCall's as well.