  We present spectroscopic observations of superthin galaxies. Superthin
galaxies have the thinnest stellar disks among disk galaxies. A sample of 138
superthins was observed in visible light with the 3.5 m telescope at Apache
Point Observatory in New Mexico to obtain the rotation curves of the ionized
gas in the galaxies. The sample represents the largest survey of superthin
galaxies so far and provides a database to investigate the kinematic and
dynamic properties of this special type of extragalactic objects. Here we
present the rotation curves of our sample objects.
