http://book.klll.cc/ebooks/subject/39725.opds 2025-09-17T00:32:06Z Books about Astronomers -- Pennsylvania -- Biography (sorted by popularity) Free eBooks since 1971. Project Gutenberg https://book.klll.cc webmaster@gutenberg.org https://book.klll.cc/gutenberg/favicon.ico 25 1 2025-09-17T00:32:06Z https://book.klll.cc/ebooks/72283.opds Memoirs of the life of David Rittenhouse, LLD. F.R.S., late president of the American Philosophical Society, &c. : interspersed with various notices of many distinguished men : with an appendix, containing sundry philosophical and other papers, most of which have not hitherto been published William Barton