<a href="https://maoistlegacy.de/" target="_blank" rel="noreferrer noopener">The Maoist Legacy</a>
<a href="https://chineseposters.net/" target="_blank" rel="noreferrer noopener">Chinese Posters Propaganda, Politics, History, Art</a>
This is the most popular archive among my students.
Source of Image:
Xin Liliang - New view in the rural village
https://chineseposters.net/posters/e12-527.php