Thanks, Gumby, for your donation. I've done more volunteer work there now and see that there are some subjects that we have no material on, so I thought I'd list some that stand out: starting a small business
cartooning and drawing
almanacs (not more than 3 years old)
dictionaries and thesaurus/thesauri
mini encyclopedias
learning foreign languages
calligraphy
improving spelling, writing skills
inventions, how things work
science fiction and fantasy
So if you have any books on these subjects, please help out by donating them to Books to Prisoners!

Thanks, kind-hearted folks!