A Princess of Mars

US original; the McClurg (Chicago) 1917 is the true first edition in book form and the census claim is correct on this point. The text was serialized as "Under the Moons of Mars" in The All-Story, February–July 1912, five years before book publication and before Tarzan of the Apes (1914) appeared in book form. The census claim of a Methuen 1919 UK first is NOT confirmed and appears to be an error: the ERBzine C.H.A.S.E.R. and Chrono-Log entries list no Methuen date for this title, while dealer listings (Rooke Books, Biblio, AbeBooks) consistently record the Methuen (London) edition as 1920 — the same year Methuen issued The Gods of Mars. The exact UK first year could not be pinned to an authoritative bibliography; treat it as Methuen (London), 1920. In any case the Methuen is a later, secondary edition and does not compete for precedence — McClurg carries priority.