Launched in 1990, the NASA/ESA Hubble Space Telescope remains the premier UV and visible light telescope in orbit. With well over 1.6 million observations from 10 different scientific instruments, the ESA Hubble Science Archive is a treasure trove of astronomical data to be exploited.
European Space Agency, Westphal comma J. A., 1993, 'THE STRUCTURE AND ENVIRONMENT OF HII REGIONS IN THE GALAXY AND M33, WFPC AUGMENTATION, CYCLE 2', 1.0, European Space Agency, https://doi.org/10.5270/esa-prvgg51