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% replaces any number of letters (la% - lake, lamp)_ replaces one letter (ca_ - car, cat)

Crossword clues for John of the Sierra Club 4 letters:

MUIR: Sierra Club founder John ___
MUIR: Sierra Club cofounder John
MUIR: Sierra Club founder John
MUIR: John of the Sierra Club
MUIR: John who founded the Sierra Club
MUIR: John who cofounded the Sierra Club
MUIR: Conservationist John who co-founded the Sierra Club
MUIRS: Sierra Club founder John et al.