REMOVE

1. Slate
2. blackboard slate
3. 19th-20th century
4. 18th-20th century

WHAT

1. 5 slate chalkboards (5)
2. image-making equipment (5)

WHERE

1. Roxbury (5)
2. Roxbury, Massachusetts (5)
3. UMass Archaeological Serv … (5)

WHEN

1. creation date (5)