To be patriotic! From Robert Ambrogi’s blog:

In 1926, the editor of the Harvard Law Review, Erwin Griswold, produced a pamphlet covering proper forms of legal citation. Originally published with a brown cover, the cover was changed to blue for the sixth edition in 1939 as a patriotic gesture to get away from a color associated with Nazi Germany.

I did not know that.

And I will resist every temptation to make a joke about the Bluebook and Fascism in violation of of Godwin’s Law.