I made a Plastic Man list if someone wants to turn it into an image (this isn't in any particular order).
Quality Comics:
Police Comics (1941) - Appears in issues #1-102
Plastic Man (1943)
These are public domain and can be found at
https://digitalcomicmuseum.com/DC Comics:
Adventure Comics (1938) - #467-478
The Brave and the Bold (1955) - #148
Plastic Man (1976) - Begins at issue #11
Plastic Man (1988) - Four issue limited series
Plastic Man Special (1999)
Plastic Man (2004)
Plastic Man (2018)
Convergence: Plastic Man and the Freedom Fighters (2015)
The Power of SHAZAM! (1995) - #21
Secret Origins (1986) - #30
The Super Friends (1976) - #36, #43, #45
Action Comics (1938) - #661 connects to Superman (1987) - #110
