Questions about the National Art Gallery. Please help!?

Question

I am doing a short summary about the National Gallery of Art museum located in Washington D.C.

Does anyone know what kind of art is included in their collection? I, ESPECIALLY, want to know from what periods and areas do they collect and for what do they seem to be best known for?

PLEASE include your sources where you get your information!

Answer 1

http://www.nga.gov/

Answer 2

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