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https://www.gutenberg.org/ebooks/62992
The Evolution of Worlds by Percival Lowell | Project Gutenberg
Free eBook digitized and proofread by volunteers.
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https://www.astronomy.com/science/percival-lowells-three-early-searches-for-planet-x/
Percival Lowell's three early searches for Planet X | Astronomy.com
May 18, 2023 - Percival Lowell completed three searches for Planet X before Clyde Tombaugh discovered Pluto.
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https://archive.org/details/ismarshabitablec00wallrich
Is Mars habitable? [microform] : a critical examination of Professor Percival Lowell's book "Mars...
Includes bibliographical references
https://archive.org/details/marsabodeoflife00loweiala
Mars as the abode of life : Lowell, Percival, 1855-1916 : Free Download, Borrow, and Streaming :...