Good idea, Kees, but "my" tree (which is named after a bear) is not the Lincoln tree, and actually it shall represent the entire area where it is standing. The Lincoln tree is not found in Sequoia National Park (as I eventually discovered); rather, not far away from there.
Hint #2: The history of the tree's environment has to do with something A. Lincoln did in 1864, although he had never been there.