Martha and her daughter, Alexis, collect armfuls of pinecones at Yosemite National Park in 1970.

Martha and Alexis explore a waterfall pool at Yosemite.

On the way to Yosemite, Martha and Alexis stop to pose by the giant redwoods at Sequoia National Park.

Martha and Alexis fly-fish at Big Sandy Lake in the Bridger-Teton National Forest in 1994.

A relaxed Martha floats out on the lake with her fishing pole in hand.

Martha hiked California's Joshua Tree National Park with some colleagues in 2009; here she stands in front of one of the park's namesake "trees."

Can you spot Martha among the giant rock formations?

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