the great comet of 1881 - étienne léopold trouvelotcomet biela in 1846 - bilderatlas der sternenwelt - 1888comet, september 29, 1908the outline of science - a plain story simply toldedited by j. arthur thomsong.p. putnam's sons, knickerbocker press - 1922illustration of the leonids (1799)the midnight sky - edward dunkin - 1872the meaning of mystery is to be always in ambiguity, with double,