A most certaine and true relation of a strange monster or serpent found in the left ventricle of the heart of John Pennant, Gentleman, of the age of 21 yeares (1639)
May, Edward, active 1633-1637 · London : George Miller · leaf 15
Pennant, John · Heart -- Parasites
Internet Archive · Wellcome Library · Public domain (published before 1931). Free to use for anything.