Dairy Comics lot milk promotional comic books late 60s or 70s vintage

Lot of old 'Dairy Comics' comic books - meant to be handed out to kids from the milkman, zip code era. So late 60s, or early 70s vintage? I didn't even know there was milk delivery in modern, zip code times. LOL

There's multiple copies here, of just two different issues. All have age and wear, these have been saved away in a dairy barn for many years.