The Grove City Area Historical Society will welcome Gibsonia native Ginny Campbell to its Speakers Series on Tuesday, July 29.

As a self-educated researcher on George Washington’s Trail through Pennsylvania, Campbell has uncovered interesting facts that bring into question the accuracy of the current trail markings, particularly in the Grove City and Slippery Rock area.

As a young soldier and diplomat in the Virginia Regiment, Washington was charged with the task of carrying orders to the French at Fort LeBoeuf, Fort Machault and Fort Presque Isle.

Washington and his guide, Christopher Gist, kept a detailed journal of their travels, and Campbell found that their journal entries did not match the currently established route. Being a self-described “puzzle solver,” Campbell has outlined Gist’s exact 82-mile route between Logtown and Venango. She said the pair passed through Grove City and Slippery Rock on foot on their return trip from Fort LeBoeuf.

Campbell will present her perspective at 6:30 p.m. at 111 College Ave., Grove City. Admission is free, and the building is air-conditioned.