There's a person on NBA subreddit who compiled a large number (hundreds) of high-resolution photos of NBA (and ABA). I thought this could be really useful for anyone working on retro rosters or mods. Here are the links, collections are separated by eras:
40s, 50s & 60s: https://imgur.com/a/6kT84Jz
70s: https://imgur.com/a/wsKLIFQ
80s: https://imgur.com/a/8a9NGTw
90s: https://imgur.com/a/5L9REIl
2000s: https://imgur.com/a/mNczwHP
Tip: To see the full size image, it's not enough to just zoom in from the main link. Instead, open the image in the new tab like this: https://i.imgur.com/6FpTPcF.jpg and then zoom in.
Credit to reddit user u/macgarnickle for compiling these lists as well as the original photographers
Sample photo: