If he taught classes, get in touch with the school. If he won contests, get in touch with whatever organization held them. And libraries would also be a good option. Any documentation of your husband inheriting them and subsequently you inheriting them will help if you intend to publish or sell them.

I had a teacher who passed away who was a very talented photographer. His family put some of his work up for sale in a gallery and there was a show. It was a great opportunity for friends and family to get together and celebrate his life and his work.

What kind of photography was it? Travel? How much material are we talking about? How much effort are you willing to put in to do something meaningful with it? Please don’t just throw it out!