El_Marsh posted...
I know all of these characters except the cow, and it's driving me crazy lol
Borden Dairy's "Elsie the Cow" which shocked me that I was actually right in my guess.
"It was a 36-page one-shot comic that featured, on its cover, Olive Oyl, Little Lulu, Wonder Woman, Sheena, Queen of the Jungle, Mary Marvel, and Elsie the Cow marching under the Womens Liberation banner."
https://www.visiblewomen.work/post/march-6th-trina-robbins