Sierra Club cofounder
Crossword clue · 1 known answers · 3 appearances · Last seen in the Newsday crossword on June 21, 2026
Latest answer · Verified
MUIR
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About this clue
The clue “Sierra Club cofounder” has appeared 3 times in our database with 1 different answers, so count the squares in your grid and check the crossings before you commit. Most recently it ran in the Newsday crossword on June 21, 2026, where the answer was MUIR.