Appleton Library, 2916 Sennebec Road, will hold its Third Thursday Talk, Triple Crown of Hiking, with Zack and Zan Lockhart, Thursday, March 21 from 7 to 8 p.m. The Lockhart's will share their adventures hiking the Triple Crown: Appalachian Trail, Pacific Crest Trail and the Continental Divide.  They will illustrate their adventures with a PowerPoint presentation and video footage, along with bringing some gear.  For more information, call 785-5656 or email