I am looking for authoritative science texts in chemistry. biology, and other sciences that are current and can be distributed for public benefit without problems with copyright.
A science text must be less than 10 years old because of new research.
I have been able to locate, for example, out-of-copyright books by Darwin, but they would be supplemental. There are complete, out-of-copyright, instructional texts in English, that are dated but still usable. But so far no current intro science texts.
any suggestions appreciated.