Smith, MalcolmCarswell, R.Whelan, J.Wilkes, BelindaBoksenberg, A.Clowes, R.Savage, A.Cannon, R.Wall, J.2017-06-081981Smith, M. G., R. F. Carswell, J. A. J. Whelan, B. J. Wilkes, A. Boksenberg, R. G. Clowes, A. Savage, R. D. Cannon, and J. V. Wall. 1981. “Observations of the Lyman Limit in 19 QSOs.” Monthly Notices of the Royal Astronomical Society 195 (3) (July 1): 437–449. doi:10.1093/mnras/195.3.437.0035-8711http://nrs.harvard.edu/urn-3:HUL.InstRepos:32955261From direct spectroscopic observations of the Lyman-limit region in 32 QSOs, 19 of which are described here, we find that the covering factor for large absorbing clouds in the emission region is likely to be ϵ≲0.15. Under these circumstances, it is unlikely that the mechanism for explaining the low Lyα/Hβ emission-line intensity ratios in QSOs involves significant suppression of Lyα.en-USJournal Article2017-02-0819812017-06-0810.1093/mnras/195.3.437