Relatives of the victims of the 1985 Japan Airlines jumbo jet crash have published a collection of essays as part of efforts to keep alive the tragedy -- which killed 520 people -- ahead of its 20th anniversary on Aug. 12.

The collection is the latest installment of the annual booklet by the relatives' association. Titled "Akanegumo" ("Red Clouds"), it takes its name from the clouds those aboard JAL Flight 123 may have seen before the 747 crashed into a mountain in Gunma Prefecture near sunset at 6:56 p.m. that summer day.

It remains the worst single-aircraft accident in aviation history.