BRYAN EATON/Staff Photo. Nancy Griffin of the Custom House Maritime Museum asks Bresnahan School third-graders if they know what a channel is as she talks about the rear range light and how it was used for navigation in the Merrimack River. The students toured the museum along with the US Coast Guard Station Merrimack and old homes in the downtown as they got an introductory into how history is very local and not just in textbooks.

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