http://book.klll.cc/ebooks/subject/28703.opds2025-08-09T15:42:57ZBooks about Smallpox vaccine (sorted by popularity)Free eBooks since 1971.Project Gutenberghttps://book.klll.ccwebmaster@gutenberg.orghttps://book.klll.cc/gutenberg/favicon.ico2512025-08-09T15:42:57Zhttps://book.klll.cc/ebooks/49475.opdsAn Estimate of the True Value of Vaccination as a Security Against Small PoxT. M. Greenhow