HI-MaNGA is a 21cm follow-up program for the SDSS-IV MaNGA survey [1], a survey of 10,010 unique galaxies with an Integral Field Unit (for resolved optical spectroscopy). The primary goal of HI-MaNGA is to observe all z<0.05 MaNGA galaxies with the Green Bank Telescope which lack HI data from other sources.

Acknowledgement
For publications that make use of these data please cite Masters et al. 2019 [2] and Stark et al. 2021 [3].
Please also acknowledge the GBT Legacy Archive and the Observatory by including the following acknowledgements in your publication:
This publication makes use of the GBT Legacy Archive.
The Green Bank Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc.
Data Releases
Catalogs
Data
Additionally, here is the README [4] for DR3 data and DR3.1 Catalog.