REMOVE

1. blackboard slate
2. Roxbury, Massachusetts
3. 19th-20th century

WHAT

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

WHERE

1. Roxbury (5)
2. UMass Archaeological Serv … (5)

WHEN

1. 18th-20th century (5)
2. creation date (5)