Adult Coloring Books Were Popular (and Subversive) in the 1960s, Smart News

Coloring books made fun of corporate culture, conspiracy theorists and Communist fears

Alan Moore – Ryan C.'s Four Color Apocalypse

How adult coloring books became a million-dollar trend

Grown-Ups Get Out Their Crayons - The New York Times

Adult Coloring Books Were Popular (and Subversive) in the 1960s, Smart News

60s Fashion Coloring Book: 50 Vintage Stylish Outfits to Color for Teen Girls and Adult Women for Relaxation and Stress relief: 9798395375575: Virems, Luciane: Books

1960s Coloring Book

Beyond Adult Coloring Books - WSJ

The Adult Coloring Books of the 1960s Are Insanely Snarky - Brit + Co

In the 1960s, Adult Coloring Books Were Radical Texts - Atlas Obscura