Archive of OZ, the London underground countercultural newspaper

every single issue of the influential psychedelic underground newspaper published in London between 1967 and 1973 after several years of an Australian version. here.

Psychedelic ads from the 60s and 70s: Woolworth's, Wrangler Jeans, Levis, Pontiac, etc.

Even...Campbell Soup. 

Many more examples here.

Reference: Thomas Frank, The Conquest of Cool.