Yen-Chang Chen, DMD, right, of Auburn Plaza Family Dental, 730 Center St., has achieved the highest level of business sponsorship of the Androscoggin Historical Society with a donation of $750, as well as an additional contribution of $400. Douglas Hodgkin, left, of the AHS board, said the contributions enable the society to preserve local historical documents and artifacts in its library and museum on the third floor of the county building for the benefit of the public, genealogists and business and governmental researchers. Programming also includes educational programs in the society’s headquarters and in the community.