Subject encyclopedias can also be useful for getting an overview of a topic. They also present in-depth information and provide bibliographies for further research. Here are two that are useful for Aerospace Engineering.
Encyclopedia of Aerospace Engineering by 
Wiley Encyclopedia of Electrical and Electronics EngineeringKnovel is an online collection of over 600 engineering handbooks and reference sources. Search or browse individual books or search across the entire collection. Many of the handbooks in Knovel feature interactive tables and graphs and you can export data to Excel and other programs.
Our subscription includes the civil engineering & construction materials, electrical & power engineering, mechanics & mechanical engineering subject collections. Machinery's Handbook and other popular mechanical engineering references are in the Knovel collection.
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