Many thanks to SWLing Post contributor, Mario Filippi (N2HUN), who writes:

Not sure if you are familiar with this site, run by Tony, WB2JKJ, a NYC school teacher and a great guy:

https://www.hamradiomanuals.com/

I’ve dealt with him in the past with excellent satisfaction. I know that many manuals can be found free on-line, but if that isn’t the case, Tony may have it.

He’s also involved with teaching city school kids about amateur radio and welcomes donations of ham radio gear. I’ve donated items to his cause and felt good about it: http://www.wb2jkj.org/

He always follows up with a nice thank you letter from the school.

Thank you so much for sharing this recommendation, Mario!