  We present the data release paper for the Galaxy Zoo: Hubble (GZH) project.
This is the third phase in a large effort to measure reliable, detailed
morphologies of galaxies by using crowdsourced visual classifications of colour
composite images. Images in GZH were selected from various publicly-released
Hubble Space Telescope Legacy programs conducted with the Advanced Camera for
Surveys, with filters that probe the rest-frame optical emission from galaxies
out to $z \sim 1$. The bulk of the sample is selected to have $m_{I814W} <
23.5$,but goes as faint as $m_{I814W} < 26.8$ for deep images combined over 5
epochs. The median redshift of the combined samples is $z = 0.9 \pm 0.6$, with
a tail extending out to $z \sim 4$. The GZH morphological data include
measurements of both bulge- and disk-dominated galaxies, details on spiral disk
structure that relate to the Hubble type, bar identification, and numerous
measurements of clump identification and geometry. This paper also describes a
new method for calibrating morphologies for galaxies of different luminosities
and at different redshifts by using artificially-redshifted galaxy images as a
baseline. The GZH catalogue contains both raw and calibrated morphological vote
fractions for 119,849 galaxies, providing the largest dataset to date suitable
for large-scale studies of galaxy evolution out to $z \sim 1$.
