Where do you look for mathematical research data?

Where do you look for mathematical research data?

(or where do you find it?)
First Choice*
(here I start my search for math research data)
Other:
(add your own way of finding math research data here for First Choice)
Second Choice
(here I continue looking for math research data)
Other:
(add your own way of finding math research data here for Second Choice)
Third Choice
(here I look for math research data too)
Other:
(add your own way of finding math research data here for Third Choice)
Should be Empty: