History of Science and Technology 

Dictionary of Scientific Biography will provide detailed information about scientists throughout history, including references to

• primary sources (what they wrote), and
  
• secondary sources (what other people wrote about them)

Do you need general information about a particular scientist, how science has developed in a country or region, or other background about the history of science or technology?

Look on C Level, either in the Science Reference section or on the regular shelves:

• histories of science from all eras Q125
  
  
• histories of science and technology in individual countries Q127
  
  
• biographical information on scientists throughout history Q141
  
  
• the nature of science and how science has been thought about  Q175

In addition, the Cambridge Histories are now online. You can just the History of Science section or search the entire collection for your topic.