california_housing_data*.csv is California housing data from the 1990 US
Census; more information is available at:
https://developers.google.com/machine-learning/crash-course/california-housing-data-descriptionmnist_*.csv is a small sample of the
MNIST database, which is
described at: http://yann.lecun.com/exdb/mnist/anscombe.json contains a copy of
Anscombe's quartet; it
was originally described in