This older study (2003) provides excellent, succinct background: Colonization of Venus by Geoffrey A. Landis https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa

This older study (2003) provides excellent, succinct background: Colonization of Venus by Geoffrey A. Landis https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20030022668.pdf https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/200300... Although the surface of Venus is an extremely hostile environment, at about 50 kilometers above the surface the atmosphere of Venus is the most earthlike environment (other than Earth itself) in the solar system.