There are some reference books I reach for again and again. If your personal library doesn't include these books, maybe it's time to add them.
The CRC Handbook is one of the first reference guides any science student meets. For many, it holds a permanent spot in their bookcases and on their desks. I have a copy from 1983 that has followed me everywhere. The
CRC Handbook is also available online through a subscription service.

Merck PressThe Merck Index is considered to be the best place to go for comprehensive information on biological chemicals and drugs. It would be difficult to find a laboratory without a copy nearby.
Like the Merck Index, Lange's Handbook is a standard reference for chemists. This handbook contains the properties of many organic and inorganic compounds.
If you are looking for a clear, easy to read description for a scientific term or topic, Scientific American is the place to go. This is a great general information tool for both professionals and students.
Not sure what that particular term means? As Mom used to say, "Grab a dictionary". Not sure about the difference between an
alkene and
alkyne? Grab a chemistry dictionary.