Related Clues:

• Pacific ___ College
• Boulevard border, perhaps
• They line some old streets
• Avenue liners
• Hardwood sources
• Mighty trees
• Some street liners
• Boulevard liners
• Members of the beech family
• Tennyson's 'immemorial ___'
• Shade makers
• They were nuts once
• Symbols of sturdiness
• Colonnade trees
• Street shaders