Note: Aetna and Etna are the same place, and both spellings occurr in contemporary records. Additionally, Read's Mill is a later name for the same area.

In 1766, the first step of construction of the Etna furnace was to build a sawmill to supply lumber for the community surrounding the furnace. (Also spelled Aetna). The Etna furnace property had been called the "Sawmill Tract" prior to this. The mill is said to have been located south of Tabernacle Road, at the north end of Lower Etna Lake. There is a public beach there today.

In 1773 the Etna Furnace was no longer being used, and fell into disrepair. The property was sold and repairs were made, and the tract was renamed by the new owner as "Read's Mill."

By the 1920s, at least part of this property was part of what is now known as Medford Lakes.