The Lycoming County Genealogical Society Library is housed at the Lycoming County Historical Society's Thomas T. Taber Museum (858 W. 4th Street, Williamsport, PA 17701; 570-326-3326). The library is open 12pm-4pm Tuesday-Friday. Visit them online and email them at LycomingLineage@gmail.com. Many research tools have recently been made available to the public at no cost; check them out at https://lycominglineage.wixstudio.io/lycominglineage/research-tools. For membership information, go to https://lycominglineage.wixstudio.io/lycominglineage/become-a-member. Volunteers are welcome.
The James V. Brown Library is located at 19 E. 4th Street in Williamsport, PA (17701; 570-326-0536). Find them online at https://jvbrown.edu. Their online resources include local newspaper archives - some with remote access, others onsite only; digitized photos, images, and historical documents, and, under "Resources for Adults", access to MyHeritage Library Edition (a competitor to Ancestry.com, offered remotely) and Family Search, a product of The Church of Jesus Christ of Latter-Day Saints - some of its features are for in-library use only.