Where were you on May 18, 1980?

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Do you have photographs or a special memory of the day Mount St. Helens erupted catastrophically?

If so, The Columbian is compiling an online memory book.

Simply go to http://www.columbian.com/forms/st-helens/ and follow the prompts. Responses will be subject to editing before being posted online.

This year marks the 30th anniversary of the moment, at 8:32 a.m. on May 18, when a magnitude-5 eruption triggered the biggest landslide in recorded history. The bulging north face of the mountain gave way, uncorking a gas-charged reservoir of magma in an event that leveled 150 square miles of forest, killed 57 people and jetted a 15-mile-high plume of ash that circled the globe.