ASTORIA — Lewis and Clark National Historical Park, Fort Clatsop announces the next In Their Footsteps free speaker series event. The program is “Pacific Northwest Foraging” presented by Douglas Deur at 1 p.m. Sunday, April 19 in the Netul River Room of the Fort Clatsop visitor center.

A research professor at Portland State University, Deur has worked with tribes and national parks throughout the western United States, and western Canada, documenting traditional Native American environmental knowledge and practices.

Deur’s 2014 book, “Pacific Northwest Foraging,” distilled some of the lessons of his work relating to the abundant plant harvest opportunities in the Northwest. This book, the focus of this month’s In their Footsteps presentation, appeared on the New York Times bestseller list. While the book is largely a plant-gathering guide, it was written with the guidance of tribal elders and seeks to engage the deeper philosophical foundations of foraging for a general audience.

Deur’s book is available at the Lewis & Clark National Park Association bookstore in the visitor center. There will be a book signing following his presentation.

This monthly Sunday forum is sponsored by the Lewis & Clark National Park Association and the park.

This season of In Their Footsteps will conclude with the May 17 presentation “Lewis and Clark and Cataclysms on the Columbia” by Jim O’Connor, a geologist with the U.S. Geological Survey.

For more information, call the park at 503-861-2471.