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?
See Martha's Guide to Western National Parks
See more exclusive photos from Martha's life and home.
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