The Greater Oneonta Historical Society (GOHS) will introduce its self-guided walking tour of historic Main Street this Sunday at 2 p.m.  Funded by an Otsego County Community Events Grant, the self-guided walking tour is in the format of an app for mobile devices.  The app was constructed by Sweet Home Productions based on content provided by GOHS executive director Bob Brzozowski. The app will be accompanied  by a print version which will be downloaded at OneontaHistory.org.  At the launch, visitors will view a version of the app, and then be able to download it for free and try it out on the street. Refreshments will be served. This event is free and open to the public. The History Center will be open on June 19 from 1:00 p.m. to 4:00 p.m.