Encyclopædia Britannica 1771–1860
Topic · 2 of 8 editions · peak 2,336 chars

I. SOURCE OF AIR

1st2nd3rd4th5th6th7th8th
EditionAs printedTypeCharsLocationvs. previous
7th ed. (1842)I. SOURCE OF AIRsub_entry1,734vol. 21, p. 596
8th ed. (1853–60)I. SOURCE OF AIRsub_entry2,336vol. 21, p. 540substantially revised · J 0.37