In order to create navigable bios and capture multiversal tangents in a coherent manner, a few assumptions are made.

Earth-Two is believed to reflect virtually every DC(National) story published pre-1955.  All material in Quality Comics, acquired by DC after the publisher folded in 1956,  published before 1942 and the events of All-Star Squadron #50 are also assumed to take place on Earth-Two.

The Multiverse proposed in the series 52 resurrected an new Earth-2, which by all appearances is an exact phenocopy of Earth-Two.  Thus the tales in which this earth appears, notably the Justice Society of America Series of the early 2000’s, are considered to be canonical for Earth-Two.  Likewise, the Gentleman Ghost story (JSA Vol. #82) is likewise considered canon for a similar reason.  All references to Earth-2 on this site will refer to the alternative version created by James Robinson post Flashpoint.

Earth-40, originally posited to be the setting for the JSA: The Liberty Files, is considered to be in continuity.  In Multiversity, it is revealed that super-villains led by Vandal Savage now rule this fallen world but the existence of the Liberty Files tales are not inconsistent with this and so assumed to still be reasonably canonical.

Earth-22, in addition to being the home of the Kingdom Come storyline, is also assumed to be the home of The Golden Age LS.  This assumption stems from news reports that James Robinson’s original sequel to The Golden Age was abandoned as he thought other tales – like JLA Year One and Kingdom Come – eliminated the need for his sequel.  It has been revealed that the JSA never reformed on Earth-22, fitting the narrative of The Golden Age.  Thus, the continuities are considered to be linked.

Publication of Wonder Woman adventures in the late 1970's adhered more toward the World War II continuity of her television series and less than her appearances during the comics of the 1940's.  Nevertheless, they are often referred to Earth-Two and Justice Society members appeared in almost every issue.  They are blended into canon as much as feasible with irreconcilable divergences noted as appropriate.

Earth-50 has been designated the home of the Justice Lords, an autocratic version of the Justice League established in the animated series and picked up again in the Batman Beyond print comics.  Until  otherwise revealed, character histories from the episodes featuring the Justice Lords will assumed to be applicable to Earth-50 in the comics. 

Some events - such as Arena and Convergence - featured an intense multiversal focus but were largely abandoned from a story standpoint almost immediately after publication.  They have been sparingly farmed for data in this work.