Greenbelt Alliance:
karen and group
Greenbelt Alliance:
welded cinder rock!
Greenbelt Alliance:
sprawl development next to park
Greenbelt Alliance:
sibley maze
Greenbelt Alliance:
columner basalts p
Greenbelt Alliance:
quarry pit volcanic vent
Greenbelt Alliance:
karen and volcanic rock
Greenbelt Alliance:
mt diablo in the distant
Greenbelt Alliance:
on the trail
Greenbelt Alliance:
quarry pit and maze
Greenbelt Alliance:
sprawl development adjacent to park
Greenbelt Alliance:
view from top of the quarry